QCVN 02:2022/BXD National Technical Regulation on Natural Physical and Climatic Data for Construction

Foreword

QCVN 02:2022/BXD was developed under the lead of the Institute for Building Science and Technology (with the collaboration of the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment, the Institute of Geophysics – Vietnam Academy of Science and Technology, and the Vietnam Association of Building Environment), submitted for approval by the Department of Science, Technology and Environment, appraised by the Ministry of Science and Technology, and issued by the Ministry of Construction in conjunction with Circular No. 02/2022/TT-BXD dated September 26, 2022 by the Minister of Construction.

QCVN 02:2022/BXD replaces QCVN 02:2009/BXD, which was issued in conjunction with Circular No. 29/2009/TT-BXD dated August 14, 2009 by the Minister of Construction.

1 GENERAL PROVISIONS

1.1 Scope of regulation

1.1.1 This technical regulation specifies the natural condition data applied in the formulation, appraisal, and approval of construction activities including construction planning, development of construction investment projects, construction design, construction execution, construction supervision, and management of construction investment projects in Vietnam.

1.1.2 In certain specific cases, it is permitted to use wind data, earthquake data, and other natural condition data used in construction provided by competent state agencies such as: Vietnam Institute of Meteorology, Hydrology and Climate Change or National Center for Hydro-Meteorological Forecasting – Ministry of Natural Resources and Environment, Institute of Geophysics – Vietnam Academy of Science and Technology… for some specific projects with justifications, clearly stating the scientific basis of the applied data, and submitted to the Ministry of Construction.

1.2 Subjects of application

This regulation applies to organizations and individuals involved in construction activities in Vietnam.

1.3 Interpretation of terms

In this regulation, the following terms are understood as follows:

1.3.1 Tropical depression

A tropical cyclone with maximum wind speed from level 6 to level 7 and may have gusts.

1.3.2 Typhoon

A tropical cyclone with maximum wind speed from level 8 and above and may have gusts. Typhoons with maximum wind speed from level 10 to level 11 are called strong typhoons, from level 12 to level 15 are called very strong typhoons, and from level 16 and above are called super typhoons.

1.3.3 Epicenter

The vertical projection of the hypocenter onto the earth’s surface.

1.3.4 Hypocenter

The location of the source that generates an earthquake.

1.3.5 Intensity of surface shaking (denoted as I)

A quantity expressing the ability of shaking caused by an earthquake on the ground and assessed through its impact on buildings, structures, ground, objects, and people. In this regulation, the intensity of surface shaking is assessed according to the MSK-64 scale consisting of 12 levels (see Tables 6.3 and 6.4).

1.3.6 Thunderstorm

A phenomenon of strong convection in the atmosphere causing sudden electrical discharges accompanied by thunder and lightning.

1.3.7 Earthquake

The shaking of the earth’s surface due to the sudden release of energy in the earth’s crust in the form of seismic waves, which can cause deformation on the ground, destruction of buildings, structures, property, and human lives.

1.3.8 Earthquake magnitude (denoted as M)

A quantity characterizing the level of energy that an earthquake releases and transmits around in the form of elastic waves. In this regulation, the earthquake magnitude (denoted as M) is assessed using the Richter scale, with a value equal to the base-10 logarithm of the maximum amplitude (micron) of the horizontal component of the seismic wave on the recording of a standard Wood-Anderson short-period seismograph at a distance of 100 km from the epicenter.

1.3.9 Atmospheric salinity

The total amount of chloride salt in the air calculated according to the number of milligrams of Cl- ions deposited on 1 m² of structure surface in a day (mg Cl-/m2 day).

1.3.10 Whirlwind

A whirling air current with wind strength equivalent to that of a typhoon but formed and dissipated in a short time, with a narrow range of activity from a few km² to a few dozen km² .

1.3.11 Flood

A phenomenon in which the river water level rises high for a certain period of time, then falls, in which: a) Historical flood is a flood with a peak rarely seen during the observation period or obtained through surveys; b) Exceptionally large flood is a flood with a peak rarely seen during the observation period; c) Abnormal flood is a flood occurring before or after the flood season or a flood formed due to heavy rain occurring in a small area, reservoir discharge, dam failure, dam overflow, dike failure, or dike overflow.

1.3.12 Flash flood

A flood occurring suddenly on small river and stream basins in mountainous areas, with rapid flow, often accompanied by mud and rocks, rising and falling quickly, with great destructive power.

1.3.13 Lightning density

The number of ground strikes per 1 km² in a year.

1.3.14 Storm surge

The phenomenon of sea level rising higher than the normal tidal level due to the influence of typhoons.

1.3.15 Lightning

The phenomenon of electrical discharges within clouds, between clouds, or between clouds and the ground.

1.3.16 Tropical cyclone

A cyclonic wind area (diameter can reach hundreds of km) formed over tropical oceans, with winds blowing counterclockwise into the center, atmospheric pressure (air pressure) in the tropical cyclone lower than the surrounding, with rain, sometimes accompanied by thunderstorms, squalls, and whirlwinds.

1.4 Data in the regulation

1.4.1 The data in this regulation include: Climate data; weather and adverse natural phenomena data; lightning density; wind data used in design; and earthquake data used in design.

1.4.2 Other natural condition data used in construction may be provided by competent state agencies in accordance with legal provisions.

1.5 Data sources

1.5.1 Source of climate data (Chapter 2) The climate data in Chapter 2 are provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

1.5.2 Source of weather and adverse natural phenomena data (Chapter 3)

Weather and adverse natural phenomena data are compiled from data provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

Data on tides in the East Sea and the distribution of storm surge heights with a 5% assurance frequency are updated to 2016.

Data on atmospheric salinity are kept the same as the previous version.

Data on earthquake epicenters and seismogenic faults, and earthquake source zones are provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

1.5.3 Source of lightning density data (Chapter 4) Data on lightning density in Vietnam are provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

1.5.4 Source of wind data (Chapter 5) Wind data in Vietnam are provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

1.5.5 Source of earthquake data (Chapter 6) Data on earthquakes in Vietnam are provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

2 CLIMATE DATA USED IN CONSTRUCTION

2.1 Climate characteristics of Vietnam

2.1.1 Climate seasons

Vietnam belongs to the humid tropical monsoon climate zone. The territory of Vietnam is divided into two regions, North and South, with different climates:

a) Northern region (from 16 degrees north latitude, parallel to the Hai Van Pass, northward): Has a cold winter. The cold month in the delta region has an average temperature of 10 ºC to 15 ºC.

b) Southern region (from 16 degrees north latitude, parallel to the Hai Van Pass, southward): Has no cold winter. The delta region is hot all year round and clearly divided into two seasons: rainy season and dry season. The rainy season lasts from May to October, and the dry season from November to April.

2.1.2 Sunshine, air temperature, solar radiation

a) Sunshine: Throughout the territory, the sunshine duration is long. The average number of sunshine hours in a year: Less than 2,000 hours in the North, more than 2,000 hours in the South.

b) Air temperature: The North has an average annual temperature commonly below 24 ºC; the South has an average annual temperature commonly from 24 ºC to 28 ºC.

c) Solar radiation: Abundant radiation. The average annual total radiation in the North is greater than 586 kJ/cm² ; in the South, less than 586 kJ/cm² .

2.1.3 Air humidity and weather seasons

Throughout the territory, the relative humidity of the air is high all year round: from 76% to 88%. In some places, during a certain period of time, there may be large changes in air humidity due to the influence of some special weather phenomena.

a) Drizzle and cold, damp period: In the North, during the winter monsoon period (northeast monsoon), there is often damp and wet drizzle, with high relative humidity, sometimes saturated. However, there are times when the northeast monsoon is accompanied by dry weather with low humidity occurring for a few days to a few weeks.

b) Humid, foggy weather: In the eastern region of the North and the coastal areas of the Central region, during the late winter and early spring (from February to April), there is often humid, foggy weather, with air temperatures from 20 ºC to 25 ºC and very high relative humidity, above 95%, sometimes saturated.

c) Hot and dry weather: In the low-lying areas hidden to the east of the Truong Son mountain range and the valleys of the Northwest region, during the summer, there are hot and dry winds blowing in the west, northwest, and southwest directions with an activity duration of 10 to 30 days in a year. The weather becomes hot and dry, with temperatures above 35 ºC and relative humidity below 55%.

2.1.4 Rain, snow

Throughout the territory, the amount of rain and the duration of rain are relatively large, averaging from 1,100 mm to 4,800 mm and from 100 days to 223 days. Rain is unevenly distributed and concentrated in the rainy months. Many rainstorms have high intensity, many consecutive and prolonged rainy spells, causing floods. Throughout the territory, there is no snow except for a few times a year and on a few high mountains in the North.

2.1.5 Construction climate zoning

2.1.5.1 Construction climate zoning

The territory of Vietnam is divided into 7 construction climate zones (Figure 2.1):

(1) Northwest region (zone I);

(2) Midland – mountainous region of North Vietnam and Northeast (zone II);

(3) Red River Delta region (zone III);

(4) North Central region (zone IV);

(5) South Central region (zone V);

(6) Central Highlands region (zone VI);

(7) Southern region (Zone VII).

2.1.5.2 Characteristics of Vietnam’s construction climate zones

a) Zone I – Northwest region: Separated by the Hoang Lien Son mountain range with the boundary line located on the eastern slope along the isoline of the heat balance index CCN_1,I= -350 cal/min (briefly called the CCN_1,I isoline). This mountain range is also the boundary dividing the influence of “cold dry” weather and “humid foggy” weather during the spring period between the two mountainous regions of the North. Due to the different influences of these two phenomena, it has led to differences in the degree of heat and cold over a long period of the first half of the year. These are factors that have a certain impact on architectural solutions. However, due to the fairly large average altitude, the basic climatic characteristic of this region is still a region with a cold winter, with cold protection solutions dominating. This region simultaneously exists all 3 climatic belts according to altitude. The climate of the Northwest mountainous region is bounded to the south by the mountainous region in the west of Hoa Binh province, due to the direct impact of polar air after passing through the Red River Delta over most of Hoa Binh province, bringing here the basic characteristics of the climate of the eastern region and the Red River Delta region with the existence of the “humid foggy” season and low temperatures in winter.

b) Zone II – Midland – mountainous region of North Vietnam and Northeast: This is the region to the east of Hoang Lien Son, separated by the isoline CCN_1,I = -350 cal/min combined with the isoline CCN_VII = 600 cal/min. This is the region with the coldest winter compared to the whole country, although in reality there are still very low temperatures in the high mountainous regions of the Northwest, but at the same altitude, the temperature in this region is significantly higher. At the same altitude, the cold protection measure in the Northeast is the most important. Being a mountainous region, the climate is strongly differentiated according to the topographic altitude, and all 3 climatic belts exist in the region.

c) Zone III – Red River Delta region: This is the region with a lower degree of cold in winter compared to the Northeast region but higher than the Northwest and North Central regions. It is bounded by the isolines CCN_1,I= -350 cal/min and ∆CCN^_year = 1,000 cal/min to the north and west. It is separated from the North Central region by the influence of hot and dry weather due to the influence of the hot and dry west wind (Lao wind), divided by the equivalent heat-humidity index CSA_IV-VII greater than 2 and CSA_VII greater than 2, and the number of “hot and dry” days in the whole year less than 10. This is a region with a hot and humid summer but almost no influence from the hot and dry west wind. Throughout the region, the climate is quite homogeneous, strongly influenced by typhoons and other sea characteristics.

d) Zone IV – North Central region: Bounded to the south by the regional boundary line, characterized by the gradual weakening of the degree of cold in winter, strongly influenced by hot and dry weather during the spring-summer period. This region has a significant difference in the rainy-humid season compared to the Red River Delta region, with CSA_IV-VII less than 2 and CSA_VII less than 2. The terrain is not homogeneous, with the influence of topographic altitude, mainly the low mountain climate belt and a small part belonging to the mid-mountain climate belt. Most of this part lies to the east of the Truong Son range, receiving the northeast monsoon and sea winds, but there are also some valley and low mountain areas hidden behind higher mountain masses to the east, so there are some characteristics of the western climate such as the westernmost areas of Thanh Hoa, Nghe An, Quang Tri, and Thua Thien Hue provinces. The North Central region is an area heavily affected by the hot and dry west wind phenomenon from April to September every year, causing harsh dry and hot weather conditions. During the active period of the hot and dry west wind, the lowest humidity can drop to 30% and the highest temperature can reach 43 ºC. In contrast, in the last months of the year (from October to December), due to the influence of the northeast monsoon and disturbances at sea, this area often experiences heavy and concentrated rainfall.

e) Zone V – South Central region: Separated from the Southern Delta mainly due to the impact of hot and dry weather, based on humidity criteria (CSA > 2) and the number of days with hot and dry weather (NKN > 10). The climate in this region is not truly homogeneous, with differentiation according to altitude. Most of the mountainous areas belong to the low mountain climate belt, a small part belongs to the mid-mountain belt, and all of them are located on the eastern side. The western boundary is mainly based on the line CCN_1,0 = 0 cal/min, and the southern part is the boundary line of the influence level of the hot and dry west wind (the number of hot and dry days caused by the Lao wind is greater than 10 days). It is the area dividing the difference in the rainy season and the degree of humidity due to the different consequences of the southwest monsoon. This boundary line is located roughly between Ninh Thuan and Binh Thuan provinces, almost completely separating Binh Thuan into the Southern climate zone.

f) Zone VI – Central Highlands region: Separated by the isoline ∆CCN_year = 700 cal/min, CCN_1,I = 0. Polar air in winter but still has a fairly cold winter in many areas (CCN_I < 0 cal/min, CCN_1,I < 0 cal/min) due to the influence of topographic altitude. In the Central Highlands, there is no significant difference in the degree of cold in winter, but the difference between the cold season and the hot season is very small, that is, there is only one thermal season per year. Being a mountainous region, the Central Highlands also has all 3 climate belts with wide plateaus having a fairly homogeneous climate according to the characteristics of the corresponding altitude belts. Due to the western slope, the Central Highlands is not affected by the “Lao wind” causing hot and dry weather.

g) Zone VII – Southern region: Separated from the above two regions by the southern boundary line of the Central Highlands climate zone and the coastal area of the South Central region. This is a region with a fairly homogeneous climate, bearing the typical characteristics of a tropical monsoon climate. Heat protection is the most important object in preventive solutions for construction works. Particularly for the sea area, the islands are grouped into the climate zones that have been divided on the mainland with nearly similar climate conditions. The islands located north of latitude 20.83°N are grouped into the Northeast climate zone. The islands located between the above latitude and latitude 16.83°N are grouped into the Red River Delta or North Central climate zones.

2.2 Using data from Chapter 2

2.2.1 Chapter 2 provides measured data at meteorological stations. When using, it is necessary to take data from the meteorological stations closest to the construction site (Figure 2.2). In addition, it is necessary to refer to the actual climate data at the construction site, especially in the following cases:

a) The construction site is located at an altitude that is significantly different from the altitude of the meteorological station;

b) The construction site is located in a terrain with factors affecting climate data such as: Mountains, hills, plateaus, valleys, rivers, streams, large lakes, sea.

If the actual data falls outside the values provided in this regulation or the data falls outside the scope of the regulation, it is necessary to contact the competent state agency to obtain official data.

When necessary, these data can be separately surveyed and researched according to the standards applicable to the project or other requirements (if any).

2.2.2 When designing structures subjected to wind loads (including the development of construction methods), the wind data in this chapter shall not be applied, but the data provided in Chapter 5 must be used.

CONSTRUCTION CLIMATE ZONING MAP

NOTE: This is a scaled-down version of the 1:1,000,000 map developed and provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

Figure 2.1 – Construction climate zoning map

VIETNAM METEOROLOGICAL STATION NETWORK

Figure 2.2 – Map of the distribution of the meteorological station network on a national scale

3 WEATHER DATA AND ADVERSE NATURAL PHENOMENA

3.1 Typhoons

A typhoon is a tropical cyclone with a maximum wind speed of level 8 or higher and may have gusts. Typhoons with maximum wind speeds from level 10 to level 11 are called strong typhoons, from level 12 to level 15 are called very strong typhoons, and from level 16 and above are called super typhoons.

Typhoons are particularly dangerous weather phenomena, causing strong winds that can blow off roofs and collapse houses, accompanied by heavy rain causing serious flooding. Table B.2 specifies the wind levels and hazard levels of typhoons.

In Vietnam, the annual typhoon season is from June to November, with the frequency of typhoons gradually decreasing from North to South. The usual occurrence times are as follows (Table B.1):

From June to September, typhoons frequently make landfall in the Quang Ninh – Thanh Hoa sea area;

From July to October, typhoons frequently make landfall in the Nghe An – Quang Binh sea area;

From August to November, typhoons frequently make landfall in the Quang Tri – Phu Yen sea area;

From October to December, typhoons frequently make landfall in the Khanh Hoa – Ca Mau sea area.

The statistics of typhoons making landfall in Vietnam’s coastal regions (1961 – 2017) are shown in Table B.3.

3.2 Whirlwinds

Whirlwinds are swirling wind currents with wind strength equivalent to that of typhoons but are formed and dissipated in a short time, with a narrow range of activity from hundreds of m² to a few dozen km² .

Whirlwinds are dangerous weather phenomena, causing swirling winds that rise high, blow off roofs, and collapse houses, especially simple houses.

According to data provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment (Table B.4): In the North, whirlwinds often occur during the transitional periods from winter-spring to summer (April, May), whenever a cold air mass appears. Due to climate change, whirlwinds also occur in the Central and Southern regions.

3.3 Floods

3.3.1 Floods occur during the rainy season when heavy rainstorms pour water strongly into rivers and streams, causing dike failures or overflowing, resulting in widespread flooding of houses and construction sites.

3.3.2 The flood season is a continuous period within a year, during which floods usually occur in the following periods:

On rivers in the North, from June 15 to October 31;

On rivers from Thanh Hoa province to Ha Tinh province, from July 1 to November 30;

On rivers from Quang Binh province to Ninh Thuan province, from September 1 to December 15;

On rivers in Binh Thuan province, provinces in the South, and the Central Highlands, from June 15 to November 30.

Historical floods (1945 – 2007) are recorded by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment in Table B.5.

3.4 Flash floods

3.4.1 Flash floods are particularly dangerous hydrological phenomena. In some cases, they have devastating destructive power and become natural disasters. Flash floods often occur in mountainous areas, where there are high mountains interspersed with valleys and low rivers and streams, the stability of the soil layer on the watershed surface is weak due to strong weathering processes, and the vegetation cover is destroyed.

3.4.2 Flash flood events over the years (1958 – 2017) are recorded by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment in Table B.6.

3.4.3 The localities prone to flash floods are: Bac Kan, Binh Dinh, Binh Thuan, Cao Bang, Dak Lak, Ha Giang, Lai Chau, Lang Son, Lao Cai, Khanh Hoa, Phu Tho, Quang Binh, Quang Nam, Quang Ngai, Quang Ninh, Quang Tri, Son La, Thai Nguyen, Tuyen Quang, Thua Thien Hue, Yen Bai.

3.5 Thunderstorms and lightning

3.5.1 Thunderstorms are classified as dangerous weather because lightning in thunderstorms can cause death, forest fires, house fires, and damage to power transmission lines, machinery equipment, especially electronic and telecommunications equipment. Thunderstorms and lightning in Vietnam occur year-round but are usually more frequent in the summer, especially in mountainous or lake areas during hot and humid months.

3.5.2 The average monthly and annual number of days with thunderstorms at meteorological stations is given in Table A.33. The map of average annual lightning strike density in Vietnam, established by the Institute of Geophysics, is presented in Chapter 4 of this regulation.

3.6 Earthquakes

3.6.1 Strong earthquakes can destroy houses and structures, causing serious damage to people and property.

3.6.2 The earthquake epicenters and seismogenic faults in Vietnam are shown on the map in Figure 3.3.

3.7 Marine hydrology

3.7.1 Marine hydrological phenomena that can adversely affect houses and construction works in Vietnam’s sea areas are tidal regimes, storm surges, and wave heights during typhoons.

3.7.2 The tidal map of the East Sea and the map of the distribution of storm surge heights with a 5% assurance frequency are shown in Figure 3.1 and Figure 3.2. The average wave heights corresponding to wind levels are referenced in Table B.2.

3.8 Atmospheric salinity

3.8.1 Salinity in the atmosphere of coastal, marine, and island areas, combined with high humidity, causes strong corrosion of steel structures, metal structures, reinforced concrete structures, and prestressed concrete structures in Vietnam.

3.8.2 The zoning map of atmospheric salinity is given in Figure 3.4. The distribution of atmospheric salinity for different parts of Vietnam is as follows:

– North and Central regions (from 16 degrees north latitude and above):

[Cl^–] = 0.9854 X^-0.17 , error ± 16% (3.1)

– Central and Southern regions (from 16 degrees north latitude and below):

[Cl^–] = 3.9156 X^-0.22 , error ± 23% (3.2)

where:

[Cl^–] – atmospheric salinity, mgCl^–/m² day;

X – Distance from the sea to the shore, km.

3.9 Using data from Chapter 3

The use of this data depends on the standards applicable to the project at each stage of design and construction.

When necessary, weather data and adverse natural phenomena data need to be provided by competent state agencies or need to be researched and surveyed based on design standards and tasks or other requirements (if any).

EAST SEA TIDAL MAP

Figure 3.1 – Tidal map of the East Sea

MAXIMUM STORM SURGE MAP

Figure 3.2 – Map of the distribution of storm surge heights with a 5% assurance frequency

NOTE: This is a scaled-down version of the 1:1,000,000 map developed and provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

Figure 3.3 – Map of earthquake epicenters and seismogenic faults in Vietnam

ATMOSPHERIC SALINITY ZONING MAP

Figure 3.4 – Atmospheric salinity zoning map

4 LIGHTNING DENSITY DATA

4.1 Characteristics of lightning density data

4.1.1 Lightning density data in Vietnam are provided in the form of a map (Figure 4.1) and by administrative location down to the district level or equivalent (Table 4.1).

4.1.2 The zoning map of average annual lightning density (number of strikes/km² /year) in Vietnam (Figure 4.1) is divided into zones with the following isolines: Less than 1.4; from 1.4 to 3.4; from 3.4 to 5.7; from 5.7 to 8.2; from 8.2 to 10.9; from 10.9 to 13.7; and greater than 13.7.

4.1.3 Lightning density data by administrative location are established based on the average annual lightning density map of Vietnam according to the following principles:

a) For locations that fall entirely within a zone with the same lightning density on the map, the lightning density of that map zone is applied.

b) For districts with isolines passing through, the lightning density is taken according to the value of the nearest higher isoline that the zones within the district may be affected by.

4.2 Using lightning density data in design

4.2.1 When designing lightning protection for structures, it is necessary to base on the lightning density at the construction site according to the data of this regulation. In addition, it must be based on other factors including the lightning protection requirements of the structure, the characteristics of the structure (type of structure, height of the structure, function of use), the terrain where the structure is built, and the distance to trees or other structures.

4.2.2 The lightning density on islands is taken from 2.5 strikes/km² /year to 7.0 strikes/km² /year.

THUNDERSTORM ZONING MAP OF VIETNAM Scale 1:1,000,000

NOTE: This is a scaled-down version of the 1:1,000,000 map developed and provided by the Institute of Geophysics – Vietnam Academy of Science and Technology. Figure 4.1 – Average annual lightning density map of Vietnam Table 4.1 – Lightning density by administrative location in Vietnam

Figure 4.1 – Map of average annual lightning density in the territory of Vietnam

Table 4.1 – Lightning density by administrative locality in the territory of Vietnam

Tinh, City	City, Town, Quan, Rural District	Lightning density (times/km²/year)
1. An Giang	C. Long Xuyen, C. Chau Doc, T. Tan Chau, RD. An Phu, RD. Chau Phu, RD. Chau Thanh, RD. Cho Moi, RD. Tan Phu, RD. Thoai Son, RD. Tri Ton, RD. Tinh Bien	13,7
2. Ba Ria – Vung Tau	C. Vung Tau, C. Ba Ria, RD. Con Dao, RD. Long Dien, RD. Dat Do, RD. Xuyen Moc	8,2
2. Ba Ria – Vung Tau	RD. Tan Thanh, RD. Chau Duc	10,9
3. Bac Kan	C. Bac Kan, RD. Ba Be, RD. Bach Thung, RD. Cho Moi, RD. Na Ro, RD. Ngon Son, RD. Pac Nam	8,2
3. Bac Kan	RD. Cho Don	10,9
4. Bac Giang	C. Bac Giang, RD. Hiep Hoa, RD. Lang Giang, RD. Luc Nam, RD. Luc Ngan, RD. Son Dong, RD. Tan Yen, RD. Viet Yen, RD. Yen Dung, RD. Yen The	8,2
5. Bac Ninh	C. Bac Ninh, RD. Gia Binh, RD. Luong Tai, RD. Que Vu, RD. Yen Phong	8,2
5. Bac Ninh	C. Tu Son, RD. Tien Du, RD. Thoan Thanh	10,9
6. Bac Lieu	C. Bac Lieu	10,9
6. Bac Lieu	T. Gia Rai, RD. Dong Hai, RD. Hong Dan, RD. Phuoc Long, RD. Vinh Loi, RD. Hoa Binh	13,7
7. Ben Tre	C. Ben Tre, RD. Chau Thanh, RD. Cho Loch, RD. Giong Trum, RD. Mo Cay Nam, RD. Mo Cay Bac	13,7
7. Ben Tre	RD. Thanh Phu, RD. Ba Tri, RD. Binh Dai	10,9
8. Binh Dinh	C.Quy Nhon, RD. Tuy Phuoc	5,7
8. Binh Dinh	RD. An Loi, T. An Nhon, RD. Hoai An, T. Hoai Nhon, RD. Phu Cat, RD. Phu My, RD. Tay Son, RD. Van Canh, RD. Vinh Thanh	8,2
9. Binh Duong	C. Thu Dau Mot, C. Di An, T. Ton UYen, C. Thoan An, RD. Bac Ton UYen	13,7
9. Binh Duong	T. Ben Cot, RD. Dau Tieng, RD. Phu Gioo, RD. Bau Bang	14,9
10. Binh Phuoc	C. Dong Xoai, T. Binh Long, RD. Chon Thanh, RD. Dong Phu, RD. Hon Quan	14,9
10. Binh Phuoc	RD. Bu Dop, RD. Bu Dang, RD. Loc Ninh, T. Phuoc Long, RD. Bu Gia Map	13,7
11. Binh Thuan	C. Phan Thiet, T. La Gi, RD. Ham Ton, RD. Ham Thoan Bac, RD. Ham Thoan Nam, RD. Tonh Linh	8,2
	RD. Duc Linh	10,9
	RD. Phu Quy	7,0
	RD. Bac Binh	5,7
	RD. Tuy Phong	3,4
12. Ca Mau	C. Ca Mau, RD. U Minh, RD. Thai Binh, RD. Tran Van Thoi, RD. Cai Nuoc, RD. Dam Doi, RD. Phu Tan, RD. Nam Can, RD. Ngoc Hien	13,7
13. Cao Bang	C. Cao Bang, RD. Bao Lac, RD. Bao Lom, RD. Ha Quang, RD. Ha Lang, RD. Hoa An, RD. NguYen Binh, RD. Phuc Hoa, RD. Quang UYen, RD. Thach An, RD. Thung Nung, RD. Tra Linh, RD. Trung Khanh	9,2
14. Can Tho	D. Binh Thuy, D. Coi Rang, D. Ninh Kieu, D. O Mon, RD. Co Do, RD. Phong Dien, D. Thot Not, RD. Vinh Thanh, RD. Thoi Lai	13,7
15. Da Nang	D. Cam Le, D. Hai Chau, D. Lien Chieu, D. Ngu Hanh Son, D. Son Tra, D. Thanh Khe, RD. Hoa Vang	8,2
15. Da Nang	RD. Hoang Sa	7,0
16. Dak Lak	C. Buon Ma Thuot, T. Buon Ho, RD. Buon Don, RD. Ea Sup, RD. Cu M’Gar, RD. Ea H’Leo, RD. Krong Buk, RD. Krong Nang	13,7
	RD. Krong Pak, RD. Krong Ana, RD. Lak, RD. Krong Bong, RD. Ea Kar, RD. Cu Kuin	10,9
	RD. M’Drak	8,2
17. Dien Bien	C. Dien Bien Phu, RD. Dien Bien, RD. Dien Bien Dong	8,2
17. Dien Bien	T. Muong Lay, RD. Muong Cha, RD. Muong Nhe, RD. Tua Choa, RD. Tuan Giao, RD. Muong Ang, RD. Nam Po	10,9
18. Dak Nong	C. Gia Nghia, RD. Krung Nu	10,9
18. Dak Nong	RD. Dak Mil, RD. Dak R’ Lap, RD. Dak Song, RD. Cu Jut, RD. Tuy Duc, RD. Dak Glong	13,7
19. Dong Nai	C. Bien Hoa, RD. Long Thanh, RD. Nhon Trach, RD. Vinh Cuu, RD. Trang Bom	13,7
	C. Long Khanh, RD. Tan Phu, RD. Dinh Quan, RD. Thong Nhat	10,9
	RD. Xuan Loc, RD. Cam My	8,2
20. Dong Thap	C. Cao Lonh, RD. Lap Vu, C. Sa Dec, RD. Tan Hong, RD. Tam Nong, RD. Thap Muoi, T. Hong Ngu, RD. Cao Lonh, RD. Thanh Binh, RD. Lai Vung, RD. Chau Thanh, RD. Hong Ngu	13,7
21. Gia Lai	T. An Khe, RD. Chu Pah, RD. Ia Grai, RD. Mang Yang, RD. Dac Doa, RD. Dac Po, RD. Kong Chro	8,2
	C. Pleiku, RD. K’Bang, RD. Ia Pa, RD. Duc Co, RD. Krong Pa	10,9
	RD. Chu Prong, RD. Chu Se, T. Ayun Pa, RD. Chu Puh	13,7
22. Ha Giang	C. Ha Giang, RD. Bac Mo, RD. Bac Quang, RD. Quan Ba, RD. Vi XuYen,	10,9
22. Ha Giang	RD. Hoang Su Pho, RD. Moo Vac, RD. Quang Binh, RD. Xon Man, RD. Dong Van, RD. Yen Minh	8,2
23. Ha Nam	C. Phu Ly, RD. Kim Bang, RD. Thanh Liem, T. Duy Tien	10,9
23. Ha Nam	RD. Binh Luc, RD. Ly Nhon	8,2
24. Ha Noi	D. Ba Donh, D. Cau Giay, D. Dong Da, D. Hai Ba Trung, D. Hoang Mai, D. Hoan Kiem, D. Long Bien, D. Tay Ho, D. Thanh Xuan, D. Bac Tu Liem, D. Nam Tu Liem, RD. Gia Lam, RD. Thanh Tro, RD. Dong Anh, D. Ha Dong, T. Son Tay , RD. Ba Vo, RD. Chuong My, RD. My Duc, RD. Phu Xuyen, RD. Thanh Oai, RD. Thuong Tin, RD. Ung Hoa	10,9
24. Ha Noi	RD. Soc Son, RD. Phuc Tho, RD. Dan Phuong, RD. Thach That, RD. Quoc Oai, RD. Hoai Duc, RD. Me Linh	8,2
25. Ha Tinh	C. Ha Tinh, RD. Cam Xuyen, RD. Can Loc, RD. Duc Tho, RD. Huong Son, T. Ky Anh, RD. Nghi Xuan, RD. Thach Ha, RD. Vu Quang, RD. Ky Anh, T. Hong Linh, RD. Loc Ha	8,2
25. Ha Tinh	RD. Huong Khe	10,9
26. Hau Giang	RD. Chau Thanh, RD. Phung Hiep	10,9
26. Hau Giang	C. Vi Thanh, RD. Vi Thuy, RD. Long My, RD. Chau ThanhA, T. Long My, T. Ngo Bay	13,7
27. Hai Duong	C. Hai Duong, RD. Binh Giang, RD. Cam Giàng, C. Cho Linh, RD. Gia Loc, RD. Nam Soch, RD. Ninh Giang, RD. Thanh Mien	8,2
27. Hai Duong	T. Kinh Mun, RD. Kim Thanh, RD. Thanh Ha, RD. Tu Ky	10,9
28. Hai Phong	D. Hong Bang, D. Kien An, D. Le Chan, D. Ngo Quyen, RD. An Duong, RD. An Loi, RD. Bach Long Vi, RD. Thuy NguYen, D. Duong Kinh	10,9
28. Hai Phong	D. Hai An, D. Do Son, RD. Tien Long, RD. Vinh Bao, RD. Kien Thuy, RD. Cot Hai	8,2
29. Hoa Binh	C. Hoa Binh, RD. Da Bac, RD. Kim Boi, Ky Son, RD. Lac Thuy, RD. Luong Son, RD. Mai Chau	10,9
29. Hoa Binh	RD. Cao Phong, RD. Tan Lac, RD. Lac Son, RD. Yen Thuy	13,7
30. Hung Yen	C. Hung Yen, RD. Phu Cu, RD. Tien Lu	8,2
30. Hung Yen	RD. An Thi, RD. Khoai Chau, RD. Kim Dong, T. My Hao, RD. Van Giang, RD. Van Lam, RD. Yen My	10,9
31. Khanh Hoa	C. Nha Trang	3,4
	C. Cam Ranh, RD. Dien Khanh, RD. Van Ninh, T. Ninh Hoa, RD. Cam Lom	5,7
	RD. Khanh Son, RD. Khanh Vinh	8,2
	RD. Truong Sa	7,0
32. Kien Giang	C. Rach Gio, C. Ha Tien, RD. An Bien, RD. An Minh, RD. Chau Thanh, RD. Giong Rieng, RD. Gu Quao, RD. Hun Dat, RD. Kien Hai, RD. Kien Luong, RD. Tan Hiep, RD. Vinh Thoan, RD. Giang Thanh, RD. U Minh Thuong	13,7
32. Kien Giang	RD. Phu Quoc	7,0
33. Kon Tum	C. Kom Tum, RD. Kon Plong, RD. Kon Ray, RD. Dak Glei, RD. Dak Ha, RD. Sa Thay, RD. Ia H’Drai	8,2
33. Kon Tum	RD. Dak To, RD. Ngoc Hoi, RD. Tu Mo Rong	5,7
34. Lam Dong	C. Da Lat, RD. Dam Rong, RD. Don Duong, RD. Duc Trong, RD. Lam Ha	10,9
	C. Bao Loc, RD. Bao Lom, RD. Cot Tien, RD. Di Linh	8,2
	RD. Da Huoai, RD. Da Teh	5,7
	RD. Lac Duong	13,7
35. Lao Cai	C. Lao Cai, T. Sa Pa, RD. Bac Ha, RD. Bat Xat, RD. Muong Khuong, RD. Si Ma Cai	8,2
35. Lao Cai	RD. Bao Thang, RD. Bao Yen, RD. Van Ban	10,9
36. Lang Son	C. Lang Son, RD. Bac Son, RD. Binh Gia, RD. Cao Loc, RD. Chi Lang, RD. Donh Lap, RD. Huu Lung, RD. Loc Binh, RD. Trang Dinh, RD. Van Long, RD. Van Quan	8,2
37. Lai Chau	C. Lai Chau, RD. Muong Te, RD. Phong Tho, RD. Son Ho, RD. Tam Duong, RD. Than Uyen, RD. Nam Nhun, RD. Tan Uyen	8,2
38. Long An	C. Tan An, RD. Ben Luc, RD. Can Duoc, RD. Can Guoc, RD. Chau Thanh, RD. Duc Hoa, RD. Ton Tru, RD. Ton Hung, RD. Tan Thanh, RD. Thu Thoa	13,7
38. Long An	RD. Duc Hue, RD. Moc Hoa, RD. Thanh Hoa, RD. Vinh Hung	14,9
39. Nam Dinh	C. Nam Dinh, RD. Giao Thuy, RD. Hai Hau, RD. My Loc, RD. Nam Truc, RD. Nghia Hung, RD. Truc Ninh, RD. Vu Ban, RD. Xuan Truong, RD. i Yen	8,2
40. Nghe An	C. Vinh, T. Cua Lu, T. Hoang Mai, T. Thoi Hoa, RD. Hung Nguyen, RD. Nam Dan, RD. Thanh Chuong, RD. Do Luong, RD. Yen Thanh, RD. Quynh Luu, RD. Dien Chau, RD. Nghi Loc	8,2
	RD. Anh Son, RD. Con Cuong, RD. Nghia Dan, RD. Tan Ky, RD. Tuong Duong, RD. Ky Son, RD. Que Phong	10,9
	RD. Quy Chau, RD. Quy Hop	13,7
41. Ninh Binh	C. Ninh Binh, C. Tam Diep, RD. Hoa Lu, RD. Kim Son, RD. Yen Khanh, RD. Yen Mo	8,2
41. Ninh Binh	RD. Gia Vien, RD. Nho Quan	10,9
42. Ninh Thuan	C. Phan Rang – Thap Cham, RD. Ninh Phuoc, RD. Thoan Nam	1,4
	RD. Bac Ai, RD. Ninh Son, RD. Thoan Bac	5,7
	RD. Ninh Hai	3,4
43. Phu Tho	C. Viet Tro, T. Phu Tho, RD. Doan Hung, RD. Ha Hoa, RD. Lam Thao, RD. Phu Ninh, RD. Cam Khe, RD. Tam Nong, RD. Thanh Ba, RD. Thanh Son, RD. Thanh Thuy, RD. Yen Lap, RD. Tan Son	10,9
44. Phu Yen	C. Tuy Hoa	3,4
	RD. Dong Xuan, RD. Song Hinh, RD. Son Hoa	8,2
	RD. Phu Hoa, T. Sung Cau, RD. Tuy An, RD. Toi Hoa, RD. Dong Hoa	5,7
45. Quang Binh	C. Dong Hoi, T. Ba Don, RD. Bo Trach, RD. Le Thuy, RD. Minh Hoa, RD. Quang Ninh, RD. Quang Trach	8,2
45. Quang Binh	RD. Tuyen Hoa	10,9
46. Quang Nam	C. Tam Ky, C. Hoi An, RD. Bac Tra My, RD. Duy Xuyen, RD. Dai Loc, T. Dien Ban, RD. Nam Tra My, RD. Phu Ninh, RD. Nui Thanh, RD. Que Son, RD. Thang Binh, RD. Tien Phuoc, RD. Hiep Duc	8,2
46. Quang Nam	RD. Dong Giang, RD. Nam Giang, RD. Phuoc Son, RD. Tay Giang, RD. Nong Son	10,9
47. Quang Ngai	C. Quang Ngai, RD. Binh Son, T. Duc Pho, RD. Ly Son, RD. Mo Duc, RD. Nghia Hanh, RD. Tu Nghia, RD. Son Tinh	8,2
47. Quang Ngai	RD. Ba To, RD. Minh Long, RD. Son Ha, RD. Son Tay, RD. Tra Bong	10,9
48. Quang Ninh	C. Ha Long, C. Uong Bi, T. Dong Trieu, T. Quang Uyen, RD. Binh Lieu	8,2
48. Quang Ninh	C. Mong Cai, RD. Ba Che, RD. Co To, RD. Dam Ha, RD. Hai Ha, RD. Hoanh Bo, RD. Tien Yen, RD. Van Do, C. Cam Pha	10,9
49. Quang Tri	C. Dong Ha, RD. Cam Lo, RD. Con Co, RD. Gio Linh, RD. Huong Hoa, RD. Vinh Linh	8,2
49. Quang Tri	T. Quang Tri, RD. Da Krong, RD. Hai Lang, RD. Trieu Phong	10,9
50. Son La	C. Son La, RD. Bac Yen, RD. Mai Son, RD. Moc Chau, RD. Muong La, RD. Phu Yen, RD. Quynh Nhai, RD. Song Mo, RD. Sop Cop, RD. Thoan Chau, RD. Yen Chau, RD. Von Ho	10,9
51. Soc Trang	C. Soc Trang, RD. Cu Lao Dung, RD. Ke Sach, RD. Long Phu, RD. My Xuyen, T. Vinh Chau, RD. Tran De	10,9
51. Soc Trang	RD. My Ty, T. Ngo Nam, RD. Thanh Tri, H Chau Thanh	13,7
52. Toi Ninh	C. Toi Ninh, RD. Chau Thanh, T. Hoa Thanh, RD. Ton Bien, RD. Ton Chau	13,7
52. Toi Ninh	RD. Gu Dau, T. Trang Bang, RD. Ben cau, RD. Duong Minh Chau	14,9
53. Thai Binh	C. Thai Binh, RD. Dong Hung, RD. Hung Ha, RD. Kien Xuang, RD. Quynh Phu, RD. Thai Thuy, RD. Tien Hai, RD. Vu Thu	8,2
54. Thai Nguyen	C. Thai Nguyen, RD. Dinh Hoa, RD. Dong Hy, T. Pho Yen, RD. Phu Binh, RD. Phu Luong, RD. Vu Nhai, C. Sung Cung, RD. Dai Tu	8,2
55. Thanh Hoa	C. Thanh Hoa, T. Bim Son, C. Sam Son, RD. Dong Son, RD. Ha Trung, RD. Hau Loc, RD. Hoang Hoa, RD. Nhu Thanh, RD. Nhu Xuan, RD. Nong Cong, RD. Nga Son, RD. Thieu Hoa, RD. Tho Xuan, RD. Quang Xuang, T. Nghi Son, RD. Trieu Son, RD. Vinh Loc, RD. Yen Dinh	8,2
	RD. Bo Thuoc, RD. Thach Thanh	13,7
	RD. Lang Chanh, RD. Muong Lat, RD. Quan Hoa, RD. Quan Son, RD. Thuong Xuan, RD. Ngoc Lac, RD. Cam Thuy	10,9
56. Thua Thien Hue	C. Hue, RD. Phong Dien, RD. Phu Loc, RD. Phu Vang, RD. Quang Dien	10,9
56. Thua Thien Hue	RD. A Luoi, T. Huong Tra, T. Huong Thuy, RD. Nam Dong	13,7
57. Tien Giang	C. My Tho, T. Gu Cung, RD. Coi Bo, T. Cai Lay, RD. Chau Thanh, RD. Ton Phuoc, RD. Cho Gao, RD. Gu Cung Dong, RD. Gu Cung Toi	13,7
58. Ho Chi Minh City	C. Thu Duc, Quan 1, Quan 3, Quan 4, Quan 5, Quan 6, Quan 7, Quan 8, Quan 10, Quan 11, Quan 12, D. Tan Phu, D. Binh Ton, D. Binh Thanh, D. Gu Vap, D. Phu NHoan, D. Ton Binh, RD. Binh Chonh, RD. NHa Bo, RD. Huc Mun	13,7
	RD. Can Gio	10,9
	RD. Cu Chi	14,9
59. Tra Vinh	C. Tra Vinh, RD. Cang Long	13,7
59. Tra Vinh	T. DuYen Hai, RD. Cau Ko, RD. Cau Ngang, RD. Chau Thanh, RD. DuYen Hai, RD. Tieu Can, RD. Tra Cy	10,9
60. Tuyen Quang	C. Tuyen Quang, RD. Chiem Hoa, RD. Ham Yen, RD. Na Hang, RD. Lom Binh, RD. Yen Son	10,9
60. Tuyen Quang	RD. Son Duong	8,2
61. Vinh Long	C. Vinh Long, RD. Long Ho, RD. Mang Thot, RD. Binh Ton	13,7
61. Vinh Long	RD. Tam Binh, RD. Tra en, RD. Vung Liem, T. Binh Minh	10,9
62. Vinh Phuc	C. Vinh Yen, C. Phuc Yen, RD. Binh XuYen, RD. Lap Thach, RD. Tam Duong, RD. Vinh Tuong, RD. Yen Lac, RD. Song Lo	10,9
62. Vinh Phuc	RD. Tam Dao	8,2
63. Yen Boi	C. Yen Bai, T. Nghia Lo, RD. Luc Yen, RD. Mu Cang Chai, RD. Tram Tau, RD. Tran Yen, RD. Van Chan, RD. Van Yen, RD. Yen Binh	10,9

5 WIND DATA USED IN DESIGN

5.1 Scope of application

The wind data in this chapter, compiled by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment, includes wind pressure and wind velocity, provided in the form of wind pressure zoning maps and zoning by administrative locality. This wind data is used in the structural design of construction works and the design of construction measures for wind load-bearing structures.

5.2 Wind pressure data (W₀)

5.2.1 The wind pressure zoning map for the territory of Vietnam (Figure 5.1) is established based on the wind velocity averaged over a period of 3 s, with a return period of 20 years (exceeded on average once in a 20-year period), at a height of 10 m above the ground, corresponding to terrain category B.

NOTE 1: The map in Figure 5.1 is provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

NOTE 2: Terrain category B is relatively open terrain with a few scattered obstacles not exceeding 10 m in height such as: sparsely populated suburban areas, towns, villages, thin forests or young forests, sparsely planted areas, etc.

5.2.2 On the map in Figure 5.1, wind pressure is divided into zones I, II, III, IV, and V, distinguished by isolines. Zone I corresponds to W₀= 65 (daN/m²), zone II corresponds to W₀ = 95 (daN/m²), zone III corresponds to W₀= 125 (daN/m²), zone IV corresponds to W₀= 155 (daN/m²), and zone V corresponds to W₀= 185 (daN/m²).

NOTE: All zones are affected by typhoons; 1 daN/m² = 10 N/m².

5.2.3 Wind pressure zoning by administrative locality down to district level or equivalent is tabulated (Table 5.1, column 3).

NOTE: This table of wind pressure zoning by administrative locality is provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change based on the Wind Pressure Zoning Map at a scale of 1:1,000,000.

5.2.4 Use of wind pressure data W₀

a) The wind pressure at the construction site is determined by one of two methods: using the Table of wind pressure zoning by administrative locality (Table 5.1, column 3) or, when greater accuracy is needed, using the Wind Pressure Zoning Map (Figure 5.1).

NOTE: Figure 5.1 is a reduced version; when reference is needed, use the large map with a scale of 1:1,000,000 stored at the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

b) In case the data provided by the competent state specialized agencies is the wind pressure W₀ (3 s, 20 years), this wind pressure data shall be used.

c) In case the data provided by the competent state specialized agencies is the wind velocity V₀, the corresponding wind pressure value _W_0 is determined by the following formula:

W₀ = 0.0613 x V₀²(5.1)

where:

W₀ (daN/m²) is the wind pressure corresponding to the wind velocity V₀;

V₀(m/s) is the wind velocity averaged over a period of 3 s, with a return period of 20 years (exceeded on average once in a 20-year period), at a height of 10 m above the reference level, corresponding to terrain category B.

5.3 Wind velocity data for 3 s, 50-year return period

5.3.1 Wind velocity zoning for 3 s, 50-year return period by administrative locality is tabulated (Table 5.1, column 4). This data is used for structural design calculations in Vietnam when using design standards with input data being the wind velocity for 3 s, 50-year return period, at a height of 10 m, terrain category B or equivalent.

NOTE: Wind velocity for 3 s, 50-year return period (T = 50 years) is the wind velocity averaged over a period of 3 s, with a return period of 50 years, at a height of 10 m above the reference level, corresponding to terrain category B.

5.3.2 When using design standards with input data being the wind velocity for 3 s, return period T other than 50 years, the wind velocity is determined by the following formula:

V_3s,T = K_s,T x V_3s,50 (5.2)

where:

V_3s,T is the wind velocity for 3 s, return period T (years);

V_3s,50 is the wind velocity for 3 s, 50-year return period;

K_s,T is the conversion factor from wind velocity for 3 s, 50-year return period to wind velocity for 3 s, return period T (years), taken from Table 5.2.

5.4 Wind velocity and wind pressure data for 10 minutes, 50-year return period

5.4.1 Wind velocity zoning for 10 minutes, 50-year return period by administrative locality is tabulated (Table 5.1, column 5). This data is used for structural design calculations in Vietnam when using design standards with input data being the wind velocity for 10 minutes, 50-year return period, at a height of 10 m, terrain category B or equivalent.

NOTE: Wind velocity for 10 minutes, 50-year return period (T = 50 years) is the wind velocity averaged over a period of 10 minutes, with a return period of 50 years, at a height of 10 m above the reference level, corresponding to terrain category B.

5.4.2 When using design standards with input data being the wind velocity for 10 minutes, return period T other than 50 years, the wind velocity is determined by the following formula:

V_10m,T = K_m,T x V_10m,50 (5.3)

where:

V_10m,T is the wind velocity for 10 minutes, return period T (years);

V_10m,50 is the wind velocity for 10 minutes, 50-year return period;

K_m,T is the conversion factor from wind velocity for 10 minutes, 50-year return period to wind velocity for 10 minutes, return period T (years), taken from Table 5.3.

5.4.3 When calculating structural design in Vietnam, using standards with input data being the wind pressure for 10 minutes, return period T equal to 50 years or different from 50 years, the following formula shall be used:

W_10m,T = 0.0613 x V_10m,T² (5.4)

where:

W_10m,T (daN/m²) is the wind pressure for 10 minutes, T years;

V_10m,T (m/s) is the wind velocity for 10 minutes, T years, determined by formula (5.3).

5.5 Wind data from specific studies

When designing special structures that are sensitive to wind loads (such as: nuclear power plants, large-span cable-stayed bridges, long bridges (located across multiple administrative localities), etc.) or construction works in areas with complex terrain (such as: high mountains, mountain gorges, between two parallel mountain ranges, mountain passes, large river mouths, etc.), wind data from specific studies conducted and provided by competent state specialized agencies must be used.

WIND PRESSURE ZONING MAP FOR CONSTRUCTION (CORRESPONDING TO WIND VELOCITY FOR 3 SECONDS, 20-YEAR RETURN PERIOD)

NOTE: This is a reduced version of the map at a scale of 1:1,000,000, compiled and provided by the Vietnam Institute of Meteorology, Hydrology and Climate Change – Ministry of Natural Resources and Environment.

Figure 5.1 – Wind pressure zoning map for the territory and sea areas of Vietnam

Table 5.1 – Wind pressure and wind velocity zoning by administrative locality

Location	Zone	W₀ (daN/m²) 3 s, 20 years	*V_3s,50*(m/s) 3 s, 50 years	*V_10m,50*(m/s) 10 minutes, 50 years
(1)	(2)	(3)	(4)	(5)
1. Ha Noi City
All quan, Town, Rural District (not including Rural District My Duc, Phu Xuyen, Thuong Tin and Ung Hoa)	II	95	44	31
Rural District My Duc (commune Dai Hung, commune Hung Tien, commune Huong Son, commune Van Kim)	III	125	50	36
Rural District My Duc (all remaining administrative locations)	II	95	44	31
Rural District Phu XuYen (commune Phu Tyc, commune Hong Minh, commune Tri Trung)	II	95	44	31
Rural District Phu Xuyen (all remaining administrative locations)	III	125	50	36
Rural District Thuong Tin (commune Minh Cuong, commune Thong Nhat, commune Tu Hieu, commune Van Diem, commune Van Tu)	III	125	50	36
Rural District Thuong Tin (all remaining administrative locations)	II	95	44	31
Rural District Ung Hoa (town Van Donh, commune Quang Phu Cau, commune Lien Bat, commune Dong Tien, commune Son Cong, commune Hoa Son, commune Truong Thinh, commune Vion Noi, commune Vion An, commune Cao Thanh, commune Hoa Xo)	II	95	44	31
Rural District Ung Hoa (all remaining administrative locations)	III	125	50	36
2. Ho Chi Minh City
All city, quan, Rural District (bao gom ca city Thu Duc, not including Rural District Cu Chi)	II	95	44	31
Rural District Cu Chi	I	65	36	26
3. Hai Phong City
All quan, Rural District (not including Rural District Bach Long Vi and Thuy NguYen)	IV	155	55	39
Rural District Bach Long Vi	V	185	61	43
Rural District Thuy NguYen	III	125	50	36
4. Da Nang City
All quan, Rural District (not including Rural District Hoa Vang and Hoang Sa)	III	125	50	36
Rural District Hoa Vang (commune Hoa Ninh, commune Hoa Phu, commune Hoa Khuong)	II	95	44	31
Rural District Hoa Vang (all remaining administrative locations)	III	125	50	36
Rural District Hoang Sa (all dao belonging to islands Hoang Sa)	V	185	61	43
5. Can Tho City
All quan, Rural District	II	95	44	31
6. An Giang
All City, Town, Rural District (not including Rural District Thoai Son, Tri Ton)	I	65	36	26
Rural District Thoai Son (town Phu Hoa, commune Dinh My, commune Dinh Thanh, commune Phu Thoan, commune Toi Phu, commune Vinh Chonh, commune Vinh Phu, commune Vinh Trach)	I	65	36	26
Rural District Thoai Son (all remaining administrative locations)	II	95	44	31
Rural District Tri Tun (town Ba Chyc, town Tri Tun, commune Chau Lang, commune Lac Quoi, commune Lo Tro, commune Nyi Tu, commune Ta Danh)	I	65	36	26
Rural District Tri Ton (all remaining administrative locations)	II	95	44	31
7. Ba Ria – Vung Tau
All City, Town, Rural District (not including Rural District Cun Dao)	II	95	44	31
Rural District Con Dao	III	125	50	36
8. Bac Lieu
All City, Town, Rural District	II	95	44	31
9. Bac Giang
All City, Town, Rural District (not including Rural District Son Dong)	II	95	44	31
Rural District Son Dong (town Tay Yen Tu, commune Duong Huu, commune Long Son, commune Thanh Luan)	III	125	50	36
Rural District Son Dong (all remaining administrative locations)	II	95	44	31
10. Bac Kan
All Rural District (not including city Bac Kan and Rural District Ngan Son)	I	65	36	26
City Bac Kan	II	95	44	31
Rural District Ngan Son	II	95	44	31
11. Bac Ninh
All City, Town, Rural District (not including Rural District Luong Tai)	II	95	44	31
Rural District Luong Tai (commune Lai Ha, commune Minh Ton, commune Trung Chonh, commune Trung Konh, commune Trung Xo)	III	125	50	36
Rural District Luong Tai (all remaining administrative locations)	II	95	44	31
12. Ben Tre
All City, Town, Rural District	II	95	44	31
13. Binh Duong
All City, Town, Rural District	I	65	36	26
14. Binh Dinh
All City, Town, Rural District (not including Rural District An Loi, Hoai An, Toi Son, Van Canh and Vinh Thanh)	III	125	50	36
Rural District An Loi (commune An Toàn, commune An Vinh, commune An Nghia)	II	95	44	31
Rural District An Loi (all remaining administrative locations)	III	125	50	36
Rural District Hoai An (commune Dak Mang, commune Bok Toi, commune An Nghia, commune An Son)	II	95	44	31
Rural District Hoai An (all remaining administrative locations)	III	125	50	36
Rural District Tay Son (commune Binh Thuan, commune Toi An, commune Toi Vinh)	III	125	50	36
Rural District Tay Son (all remaining administrative locations)	II	95	44	31
Rural District Von Canh (town Von Canh, commune Canh Lien, commune Canh Thoan, commune Canh Hoa)	II	95	44	31
Rural District Van Canh (all remaining administrative locations)	III	125	50	36
Rural District Vinh Thanh	II	95	44	31
15. Binh Phuoc
All City, Town, Rural District	I	65	36	26
16. Binh Thuan
City Phan Thiet	II	95	44	31
Rural District Bac Binh (commune Binh An, commune Binh Ton, commune Hai Ninh, commune Phan Dien, commune Phan Lom, commune Phan Son, commune Phan Thanh, commune Phan Tien, commune Sung Binh, commune Sung Luy)	I	65	36	26
Rural District Bac Binh (all remaining administrative locations)	II	95	44	31
Rural District Duc Linh	I	65	36	26
Rural District Ham Ton	II	95	44	31
Rural District Ham Thoan Bac (town Phu Long, commune Hong Son, commune Ham Liem, commune Ham Duc, commune Ham Hiep, commune Ham Thang)	II	95	44	31
Rural District Ham Thoan Bac (all remaining administrative locations)	I	65	36	26
Rural District Ham Thoan Nam (commune Ham Can, commune Ham Thanh, commune Muong Man, commune My Thanh)	I	65	36	26
Rural District Ham Thoan Nam (all remaining administrative locations)	II	95	44	31
Rural District Phu Quy	III	125	50	36
Rural District Tonh Linh	I	65	36	26
Rural District Tuy Phong	II	95	44	31
Town La Gi	II	95	44	31
17. Ca Mau
All City, Town, Rural District	II	95	44	31
18. Cao Bang
All City, Town, Rural District	I	65	36	26
19. Dak Lak
All City, Town, Rural District (not including Rural District M’Drak)	I	65	36	26
Rural District M’Drak (town M’Drak, commune Cu M’ta, commune Ea Pil, commune Krung Á, commune Krung Jing)	I	65	36	26
Rural District M’Drak (all remaining administrative locations)	II	95	44	31
20. Dak Nong
All City, Town, Rural District	I	65	36	26
21. Dien Bien
All City, Town, Rural District	II	95	44	31
22. Dong Nai
City Bien Hoa	II	95	44	31
City Long Khanh	II	95	44	31
Rural District Cam My	II	95	44	31
Rural District Dinh Quan	I	65	36	26
Rural District Long Thanh	II	95	44	31
Rural District Nhon Trach	II	95	44	31
Rural District Ton Phu	I	65	36	26
Rural District Thong Nhat	II	95	44	31
Rural District Trang Bom	I	65	36	26
Rural District Vinh Cuu	I	65	36	26
Rural District Xuan Loc	II	95	44	31
23. Dong Thap
All City, Town, Rural District (not including Rural District Chau Thanhand Lai Vung)	I	65	36	26
Rural District Chau Thanh	II	95	44	31
Rural District Lai Vung (commune Phong Hoa, commune Long Thang, commune Ton Hoa, commune Dinh Hoa)	II	95	44	31
Rural District Lai Vung (all remaining administrative locations)	I	65	36	26
24. Gia Lai
All City, Town, Rural District	I	65	36	26
25. Ha Giang
City Ha Giang	II	95	44	31
Rural District Bac Mo	II	95	44	31
Rural District Bac Quang	II	95	44	31
Rural District Dong Van	I	65	36	26
Rural District Hoang Su Pho	II	95	44	31
Rural District Moo Vac	I	65	36	26
Rural District Quang Binh	II	95	44	31
Rural District Quan Ba	I	65	36	26
Rural District Vi XuYen	I	65	36	26
Rural District Xon Man	I	65	36	26
Rural District Yen Minh	I	65	36	26
26. Ha Nam
All City, Town, Rural District (not including Rural District Binh Luc)	III	125	50	36
Rural District Binh Luc	IV	155	55	39
27. Ha Tinh
City Ha Tinh	IV	155	55	39
Town Hong Linh	IV	155	55	39
Town Ky Anh	IV	155	56	40
Rural District Can Loc	IV	155	55	39
Rural District Cam XuYen (town Thien Cam, commune Cam Duong, commune Yen Hoa, commune Cam Linh, commune Cam Loc, commune Cam Nhuong, commune Cam Trung)	IV	155	56	40
Rural District Cam Xuyen (all remaining administrative locations)	III	125	50	36
Rural District Duc Tho	II	95	44	31
Rural District Huong Khe (commune Huong Lam, commune Huong Lien, commune Huong Tra, commune Huong Vinh, commune Huong Xuan, commune Phu Gia, commune Phu Phong)	I	65	36	26
Rural District Huong Khe (all remaining administrative locations)	II	95	44	31
Rural District Huong Son (town Tay Son, commune Quang Diem, commune Son Ham, commune Son Hong, commune Son Kim 1, commune Son Kim 2, commune Son Linh, commune Son Tay)	I	65	36	26
Rural District Huong Son (all remaining administrative locations)	II	95	44	31
Rural District Ky Anh	IV	155	56	40
Rural District Nghi Xuan	IV	155	56	40
Rural District Thach Ha	IV	155	56	40
Rural District Vu Quang	II	95	44	31
Rural District Loc Ha	IV	155	56	40
28. Hai Duong
All City, Town, Rural District (not including Rural District Tu Ky)	III	125	50	36
Rural District Tu Ky	IV	155	56	40
29. Hau Giang
All City, Town, Rural District	II	95	44	31
30. Hoa Binh
All city, Rural District (not including cac Rural District Da Bac, Lac Thuy, Mai Chau and Yen Thuy)	II	95	44	31
Rural District Da Bac (town Da Bac, commune Ton Minh, commune Vay Nua, commune Cao Son, commune Ty Ly, commune Hien Luong, commune Toàn Son)	II	95	44	31
Rural District Da Bac (all remaining administrative locations)	I	65	36	26
Rural District Lac Thuy (town Ba Hang Doi, commune Hung Thi, commune Phu Thanh, commune Thong Nhat, commune Phu Loi,)	II	95	44	31
Rural District Lac Thuy (all remaining administrative locations)	III	125	50	36
Rural District Mai Chau (town Mai Chau, commune Mai Ha, commune Mai Hich, commune Nà Phun, commune Son Thuy, commune Ton Thanh, commune Dong Tan, commune Thanh Son, commune Van Mai)	I	65	36	26
Rural District Mai Chau (all remaining administrative locations)	II	95	44	31
Rural District Yen Thuy (commune Lac Luong, commune Lac Thinh, commune Lac Si, commune Da Phuc)	II	95	44	31
Rural District Yen Thuy (all remaining administrative locations)	III	125	50	36
31. Hung Yen
All City, Town, Rural District (not including Rural District Van Giang and Van Lam)	III	125	50	36
Rural District Van Giang	II	95	44	31
Rural District Van Lam	II	95	44	31
32. Khanh Hoa
All City, Town, Rural District (not including Rural District Khanh Son, Khanh Vinh and Truong Sa)	II	95	44	31
Rural District Khanh Son	I	65	36	26
Rural District Khanh Vinh	I	65	36	26
Rural District Truong Sa (all dao belonging to islands Truong Sa)	IV	155	56	40
33. Kien Giang
All City, Town, Rural District (not including Rural District Kien Hai and City Phu Quoc)	II	95	44	31
City Phu Quoc (bao gom dao Phu Quoc and cac dao khac thuoc city Phu Quoc), Rural District Kien Hai	III	125	50	36
34. Kon Tum
All City, Town, Rural District	I	65	36	26
35. Lai Chau
All City, Town, Rural District	II	95	44	31
36. Lang Son
All city, Rural District (not including cac Rural District Donh Lap and Huu Lung)	I	65	36	26
Rural District Donh Lap (commune Bac Long, commune Chau Son, commune Dong Thang, commune Lom Ca)	II	95	44	31
Rural District Donh Lap (all remaining administrative locations)	I	65	36	26
Rural District Huu Lung (commune Dong Tien, commune Hoa Thang, commune Minh Hoa, commune Minh Son, commune Thanh Son, commune Von Nham)	II	95	44	31
Rural District Huu Lung (all remaining administrative locations)	I	65	36	26
37. Lao Cai
All City, Rural District (not including Town Sa Pa and coc Rural District Bot Xot and Van Ban)	I	65	36	26
Town Sa Pa	II	95	44	31
Rural District Bot Xot (Town Bot Xot, commune Quang Kim, commune Tung Sành)	I	65	36	26
Rural District Bat Xat (all remaining administrative locations)	II	95	44	31
Rural District Van Ban (commune Dan Thang, commune Duong Quy, commune Hoa Mac, commune Khanh Yen Ha, commune Khanh Yen Trung, commune Minh Luong, commune Nam Chay, commune Nam Ma, commune Nam Xoy, commune Nam Xo, commune Tham Duong)	II	95	44	31
Rural District Van Ban (all remaining administrative locations)	I	65	36	26
38. Lam Dong
All City, Town, Rural District	I	65	36	26
39. Long An
City Ton An	II	95	44	31
Rural District Ben Luc	II	95	44	31
Rural District Can Giuoc	II	95	44	31
Rural District Can Duoc	II	95	44	31
Rural District Chau Thanh	II	95	44	31
Rural District Duc Hoa	I	65	36	26
Rural District Duc Hue	I	65	36	26
Rural District Moc Hoa	I	65	36	26
Rural District Tan Hung	I	65	36	26
Rural District Ton Thanh	I	65	36	26
Rural District Ton Tru	II	95	44	31
Rural District Thanh Hoa	I	65	36	26
Rural District Thu Thoa	II	95	44	31
Rural District Vinh Hung	I	65	36	26
Town Kien Tuong	I	65	36	26
40. Nam Dinh
All City, Town, Rural District	IV	155	56	40
41. Nghe An
City Vinh	III	125	50	36
Town Cua Lu	IV	155	56	40
Town Hoang Mai	IV	155	56	40
Town Thoi Hoa	III	125	50	36
Rural District Con Cuung	I	65	36	26
Rural District Dien Chau	III	125	50	36
Rural District Do Luong	II	95	44	31
Rural District Hung Nguyen	III	125	50	36
Rural District Ky Son	I	65	36	26
Rural District Nam Dan	II	95	44	31
Rural District Nghi Loc (commune Nghi Thiet, commune Khanh Hop, commune Nghi Quang, commune Nghi Tien)	IV	155	56	40
Rural District Nghi Loc (all remaining administrative locations)	III	125	50	36
Rural District Nghia Dan (commune Nghia An, commune Nghia Duc, commune Nghia Hieu, commune Nghia Hong, commune Nghia Hung, commune Nghia Khanh, commune Nghia Thanh, commune Nghia Mai, commune Nghia Minh, commune Nghia Thinh, commune Nghia Yen)	II	95	44	31
Rural District Nghia Dan (all remaining administrative locations)	III	125	50	36
Rural District Que Phong	I	65	36	26
Rural District Quy Chau (commune Chau Binh, commune Chau Hanh, commune Chau Hoi, commune Chau Nga)	II	95	44	31
Rural District Quy Chau (all remaining administrative locations)	I	65	36	26
Rural District Quy Hop	II	95	44	31
Rural District Quynh Luu (commune An Hoa, commune Quynh Nghia, commune Quynh Bang, commune Quynh Doi, commune Quynh Long, commune Quynh Luong, commune Quynh Minh, commune Quynh Thanh, commune Quynh Thoan, commune Quynh Yen, commune Tien Thuy)	IV	155	56	40
Rural District Quynh Luu (all remaining administrative locations)	III	125	50	36
Rural District Ton Ky	II	95	44	31
Rural District Thanh Chuong	II	95	44	31
Rural District Tuong Duong	I	65	36	26
Rural District Yen Thanh(commune Do Thanh, commune Duc Thanh, commune Hau Thanh, commune Hoa Thanh, commune Hong Thanh, commune Hop Thanh, commune Lang Thanh, commune Mo Thanh, commune Nhon Thanh, commune Phu Thanh, commune Phuc Thanh, commune Son Thanh, commune Ton Thanh, commune Tho Thanh, commune Tien Thanh, commune Van Thanh, commune Vion Thanh, commune Vinh Thanh)	III	125	50	36
Rural District Yen Thanh (all remaining administrative locations)	II	95	44	31
42. Ninh Binh
City Ninh Binh	IV	155	56	40
City Tam Diep	IV	155	56	40
Rural District Gia Vien	III	125	50	36
Rural District Hoa Lu	III	125	50	36
Rural District Kim Son	IV	155	56	40
Rural District Nho Quan	III	125	50	36
Rural District Yen Khanh	IV	155	56	40
Rural District Yen Mu	IV	155	56	40
43. Ninh Thuan
City Phan Rang – Thop Cham	II	95	44	31
Rural District Bac Ai	I	65	36	26
Rural District Ninh Hai	II	95	44	31
Rural District Ninh Phuoc	II	95	44	31
Rural District Ninh Son	I	65	36	26
Rural District Thoan Bac	II	95	44	31
Rural District Thoan Nam	II	95	44	31
44. Phu Tho
All City, Town, Rural District	II	95	44	31
45. Phu Yen
All City, Town, Rural District (not including Rural District Dong Xuan, Song Hinh, Son Hoa and Tay Hoa)	III	125	50	36
Rural District Dong Xuan (commune Phu Mo, commune Xuan Phuoc, commune Xuan Quang 1, commune Xuan Quang 2, commune Xuan Quang 3)	II	95	44	31
Rural District Dong Xuan (all remaining administrative locations)	III	125	50	36
Rural District Sung Hinh	II	95	44	31
Rural District Son Hoa	II	95	44	31
Rural District Toi Hoa (commune Hoa My Dong, commune Hoa My Toi, commune Hoa Phong, commune Hoa Phu, commune Son Thanh Dong, commune Son Thanh Tay)	II	95	44	31
Rural District Toi Hoa (all remaining administrative locations)	III	125	50	36
46. Quang Binh
City Dong Hoi	III	125	50	36
Town Ba Don	III	125	50	36
Rural District Bo Trach (commune Bac Trach, commune Dai Trach, commune Dong Trach, commune Duc Trach, commune Hai Phu, commune Ly Trach, commune Nhon Trach, commune Thanh Trach, commune Trung Trach)	III	125	50	36
Rural District Bo Trach (all remaining administrative locations)	II	95	44	31
Rural District Le Thuy (commune Ngu Thuy Bac, commune Ngu Thuy, commune Sen Thuy)	III	125	50	36
Rural District Le Thuy (all remaining administrative locations)	II	95	44	31
Rural District Minh Hoa	I	65	36	26
Rural District Quang Ninh	III	125	50	36
Rural District Quang Trach	III	125	50	36
Rural District Tuyen Hoa	II	95	44	31
47. Quang Nam
City Tam Ky	III	125	50	36
City Hoi An	III	125	50	36
Town Dien Ban	III	125	50	36
Rural District Bac Tra My (commune Tra Bui, commune Tra Doc, commune Tra Son, commune Tra Ton)	I	65	36	26
Rural District Bac Tra My (all remaining administrative locations)	II	95	44	31
Rural District Duy XuYen (commune Duy Son, commune Duy Phu, commune Duy Hoa, commune Duy Trinh, commune Duy Chau, commune Duy Thu, commune Duy Ton)	II	95	44	31
Rural District Duy Xuyen (all remaining administrative locations)	III	125	50	36
Rural District Dai Loc	II	95	44	31
Rural District Dong Giang	I	65	36	26
Rural District Hiep Duc	II	95	44	31
Rural District Nam Giang	I	65	36	26
Rural District Nam Tra My	I	65	36	26
Rural District Nong Son	II	95	44	31
Rural District Nyi Thanh	III	125	50	36
Rural District Phuoc Son	I	65	36	26
Rural District Que Son (town Huong An, commune Que My, commune Que Phu, commune Que Xuan 1, commune Que Xuan 2)	III	125	50	36
Rural District Que Son (all remaining administrative locations)	II	95	44	31
Rural District Toi Giang	I	65	36	26
Rural District Thang Binh	III	125	50	36
Rural District Tien Phuoc	II	95	44	31
Rural District Phu Ninh (Town Phu Thinh, commune Tam Lonh, commune Tam Loc, commune Tam Don, commune Tam Vinh, commune Tam Phuoc, commune Tam Thoi)	II	95	44	31
Rural District Phu Ninh (all remaining administrative locations)	III	125	50	36
48. Quang Ngai
All city, Rural District (not including cac Rural District Ba To, Minh Long, Son Ha, Son Tay and Tra Bong)	III	125	50	36
Rural District Ba To	II	95	44	31
Rural District Minh Long	II	95	44	31
Rural District Son Ha	II	95	44	31
Rural District Son Tay (commune Son Lap, commune Son Tan, commune Son Mau, commune Son Tinh)	II	95	44	31
Rural District Son Tay (all remaining administrative locations)	I	65	36	26
Rural District Tra Bong	II	95	44	31
49. Quang Ninh
All City, Town, Rural District (not including Town Quang Yen, coc Rural District Binh Lieu, Cu Tu and Von Don)	III	125	50	36
Rural District Binh Lieu	II	95	44	31
Rural District Cu Tu	IV	155	56	40
Town Quang Yen	IV	155	56	40
Rural District Van Don	IV	155	56	40
50. Quang Tri
All City, Town, Rural District (not including Rural District Gio Linh, Huong Hoa, Trieu Phong, Vinh Linh and Con Co)	II	95	44	31
Rural District Gio Linh	III	125	50	36
Rural District Huong Hoa	I	65	36	26
Rural District Trieu Phong	III	125	50	36
Rural District Vinh Linh	III	125	50	36
Rural District Con Co	III	125	50	36
51. Soc Trang
All City, Town, Rural District	II	95	44	31
52. Son La
All City, Town, Rural District	II	95	44	31
53. Toi Ninh
All City, Town, Rural District	I	65	36	26
54. Thai Binh
All City, Town, Rural District	IV	155	56	40
55. Thai Nguyen
All City, Town, Rural District (not including Rural District Dong Hy, Phu Luong and Vu Nhai)	II	95	44	31
Rural District Dong Hy (town Trai Cau, commune Hop Tien, commune Nam Hoa, commune Ton Loi)	II	95	44	31
Rural District Dong Hy (all remaining administrative locations)	I	65	36	26
Rural District Phu Luong	I	65	36	26
Rural District Vu Nhai	I	65	36	26
56. Thanh Hoa
City Thanh Hoa	IV	155	56	40
City Sam Son	IV	155	56	40
Town Bim Son	IV	155	56	40
Town Nghi Son	IV	155	56	40
Rural District Ba Thuoc	II	95	44	31
Rural District Cam Thuy	II	95	44	31
Rural District Dong Son	III	125	50	36
Rural District Ha Trung (commune Ha Hai, commune Linh Toai, commune Ha Vinh)	IV	155	56	40
Rural District Ha Trung (all remaining administrative locations)	III	125	50	36
Rural District Hau Loc	IV	155	56	40
Rural District Hoang Hoa	IV	155	56	40
Rural District Lang Chanh	II	95	44	31
Rural District Muong Lat	I	65	36	26
Rural District Nga Son	IV	155	56	40
Rural District Ngoc Lac	II	95	44	31
Rural District Nhu Thanh	II	95	44	31
Rural District Nhu Xuan	II	95	44	31
Rural District Nong Cong	III	125	50	36
Rural District Quang Xuang (town Tan Phong, commune Quang Hoa, commune Quang Hop, commune Quang Long, commune Quang Ngoc, commune Quang Phuc, commune Quang Trach, commune Quang Van, commune Quang Yen)	III	125	50	36
Rural District Quang Xuang (all remaining administrative locations)	IV	155	56	40
Rural District Quan Hoa	I	65	36	26
Rural District Quan Son	I	65	36	26
Rural District Thach Thanh	III	125	50	36
Rural District Tho Xuan (town Lam Son, Town Sao Vang, commune Quang Phu, commune Tho Dien, commune Tho Hai, commune Tho Lom, commune Tho Lap, commune Thoan Minh, commune Tho Xuang, commune Xuan Boi, commune Xuan Hoa, commune Xuan Hung, commune Xuan Phu, commune Xuan Thien, commune Xuan Ton)	II	95	44	31
Rural District Tho Xuan (all remaining administrative locations)	III	125	50	36
Rural District Thuong Xuan	II	95	44	31
Rural District Thieu Hoa	III	125	50	36
Rural District Trieu Son	III	125	50	36
Rural District Vinh Loc	III	125	50	36
Rural District Yen Dinh	III	125	50	36
57. Thua Thien Hue
City Hue	II	95	44	31
Town Huong Thuy	II	95	44	31
Town Huong Tra	II	95	44	31
Rural District A Luoi	I	65	36	26
Rural District Nam Dong (commune Thuong Lo, commune Huong Phu, commune Huong Loc)	II	95	44	31
Rural District Nam Dong (all remaining administrative locations)	I	65	36	26
Rural District Phu Loc (town Phu Loc, commune Loc Dien, commune Loc Tro, commune Xuan Loc, commune Loc Hoa, commune Loc Bon, commune Loc An, commune Loc Son, commune Vinh Hung)	II	95	44	31
Rural District Phu Loc (all remaining administrative locations)	III	125	50	36
Rural District Phu Vang	III	125	50	36
Rural District Phong Dien	III	125	50	36
Rural District Quang Dien	III	125	50	36
58. Tien Giang
All City, Town, Rural District	II	95	44	31
59. Tra Vinh
All City, Town, quan, Rural District	II	95	44	31
60. Tuyen Quang
City Tuyen Quang	II	95	44	31
Rural District Chiem Hoa	II	95	44	31
Rural District Ham Yen	II	95	44	31
Rural District Na Hang	II	95	44	31
Rural District Son Duong	I	65	36	26
Rural District Yen Son	II	95	44	31
Rural District Lom Binh	II	95	44	31
61. Vinh Long
All City, Town, Rural District	II	95	44	31
62. Vinh Phuc
All City, Town, Rural District	II	95	44	31
63. Yen Boi
City Yen Boi	II	95	44	31
Town Nghia Lo	II	95	44	31
Rural District Luc Yen	I	65	36	26
Rural District Mu Cang Chai	II	95	44	31
Rural District Tram Tau	II	95	44	31
Rural District Tran Yen	II	95	44	31
Rural District Van Chan (town Nong truong Lien Son, commune Cot Thinh, commune Gia Hoi, commune Nam Byng, commune Nam Lanh, commune Nghia Son, commune Son Luong, commune Son Thinh, commune Ty Le)	II	95	44	31
Rural District Van Chan (all remaining administrative locations)	I	65	36	26
Rural District Van Yen	I	65	36	26
Rural District Yen Binh	II	95	44	31

Table 5.2 – Coefficient K_s,T, used to convert from wind velocity for 3 s, 50 years to wind velocity for 3 s, T (years)

T, years	5	10	20	30	40	50	100
K_s,T	0,77	0,84	0,91	0,95	0,98	1,00	1,07

Table 5.3 – Coefficient K_m,T, used to convert from wind velocity for 10 minutes, 50 years to wind velocity for 10 minutes, T (years)

T, years	1	5	10	20	30	40	50	100
K_m,T	0,75	0,85	0,90	0,95	0,97	0,99	1,00	1,04

6 EARTHQUAKE DATA USED IN DESIGN

6.1 Earthquake data based on reference peak ground acceleration

6.1.1 This data applies to the design of earthquake-resistant structures in Vietnam using the reference peak ground acceleration, a_gR. The data is presented in the form of a Reference Peak Ground Acceleration Zoning Map and a Table of reference peak ground acceleration zoning by administrative locality.

NOTE 1: Reference peak ground acceleration is the peak ground acceleration on soil type A, with a reference return period of 500 years.

NOTE 2: Soil type A is rock, hard rock, with an average shear wave velocity V_s,30 > 800 m/s.

6.1.2 The Reference Peak Ground Acceleration Zoning Map (territory of Vietnam) at a scale of 1:1,000,000 is provided by the Institute of Geophysics – Vietnam Academy of Science and Technology. The map is established with a return period of 500 years for soil type A. The Reference Peak Ground Acceleration Zoning Map is shown in Figure 6.1 (this is a reduced version of the map at a scale of 1:1,000,000). The map is divided into zones, by color bands corresponding to the reference peak ground acceleration values: 0.00g – 0.02g, 0.02g – 0.04g, 0.04g – 0.06g… (g = 9.81 m/s² is the gravitational acceleration).

6.1.3 The Table of reference peak ground acceleration zoning by administrative locality down to district level or equivalent is compiled based on the Reference Peak Ground Acceleration Zoning Map at a scale of 1:1,000,000. Each district according to administrative locality has a reference peak ground acceleration value, which is considered the reference value of the entire locality. The Table of reference peak ground acceleration zoning by administrative locality is given in Table 6.1.

6.1.4 When designing earthquake-resistant structures, the reference peak ground acceleration at the construction site is determined by one of two methods: According to the Table of reference peak ground acceleration zoning by administrative locality or, when greater accuracy is needed, according to the Reference Peak Ground Acceleration Zoning Map of the territory of Vietnam at a scale of 1:1,000,000 (stored at the Institute of Geophysics – Vietnam Academy of Science and Technology).

6.1.5 In case the earthquake data (based on the reference peak ground acceleration a_gR) is provided by the competent state specialized agency, it is allowed to use this data.

6.1.6 When the design standard applied to earthquake-resistant structures uses a peak ground acceleration with requirements different from those of the reference peak ground acceleration (for example: with a return period different from 500 years or for a soil type other than A), the above values are converted by multiplying the reference peak ground acceleration of this regulation with the corresponding coefficients. These coefficients are taken according to the provisions of the applied design standard or according to specific studies.

6.2 Earthquake data based on response spectra S_S and S₁

6.2.1 This earthquake data applies to the design of earthquake-resistant structures in Vietnam using the short-period acceleration response spectrum (abbreviated as S_S response spectrum) and the long-period acceleration response spectrum (abbreviated as S₁ response spectrum) of the maximum earthquake corresponding to a return period of 2,500 years (abbreviated as the 2,500-year earthquake) for soil type B. This data is provided in the form of earthquake zoning maps and by administrative locality.

NOTE 1: Short period corresponds to a structural natural period of 0.2 s, long period corresponds to a natural period of 1 s, the structural damping ratio is 5%.

NOTE 2: Soil type B is rock with an average shear wave velocity v_s,30 from 762 m/s to 1,524 m/s.

6.2.2 The earthquake zoning maps based on response spectra for the territory of Vietnam at a scale of 1:1,000,000 are provided by the Institute of Geophysics. These maps are established with the 2,500-year earthquake for soil type B. There are two maps including: The Earthquake Zoning Map based on S_S Response Spectrum (for the territory of Vietnam) is shown in Figure 6.2 and the Earthquake Zoning Map based on S₁ Response Spectrum is shown in Figure 6.3 (these are reduced versions of the two maps at a scale of 1:1,000,000). In each map, it is divided into zones, by color bands corresponding to the response spectrum values: 0.00_g_ – 0.02_g_, 0.02_g_ – 0.04_g_, 0.04_g_ – 0.06_g_, …

6.2.3 The Tables of earthquake zoning based on S_S and S₁ response spectrum values by administrative locality down to district level or equivalent are compiled based on the two Earthquake Zoning Maps based on S_S and S₁ Response Spectra for the territory of Vietnam at a scale of 1:1,000,000. The Table of earthquake zoning based on S_S and S₁ acceleration response spectra by administrative locality is given in Table 6.2. Each district according to administrative locality has an S_S acceleration response spectrum value and an S₁ acceleration response spectrum value. These S_S and S₁ response spectrum values are considered the corresponding values of the entire administrative locality.

6.2.4 When designing earthquake-resistant structures, the S_S and S₁ response spectrum values at the construction site can be determined by one of two methods: According to the Table of zoning of S_S and S₁ response spectrum values by administrative locality or, when greater accuracy is needed, according to the Earthquake Zoning Maps based on S_S and S₁ Response Spectra at a scale of 1:1,000,000 (stored at the Institute of Geophysics – Vietnam Academy of Science and Technology).

6.3 Earthquake data based on surface shaking intensity, I

When designing earthquake-resistant structures based on the surface shaking intensity (earthquake grade) according to the MSK – 64 scale, it is necessary to convert the reference peak ground acceleration a_gR value in Table 6.1 to the earthquake grade according to the MSK – 64 scale. The conversion is carried out according to Table 6.4.

6.4 Earthquake data from specific studies

6.4.1 The earthquake data provided in this regulation is data on natural earthquakes (tectonic earthquakes). For areas that may be related to induced earthquakes, specific studies and surveys should be conducted by competent state specialized agencies to obtain earthquake data for use in design; the reference peak ground acceleration a_gR in these areas should not be taken less than 0.06×g.

NOTE: Induced earthquakes in this regulation are mainly earthquakes related to water storage in reservoirs, causing changes in the stress and strain fields in that area, triggering earthquakes.

6.4.2 When designing special and specific structures such as concrete dams with a height of over 100 m, nuclear power plants, etc., earthquake data from specific studies conducted and provided by competent state specialized agencies must be used.

NOTE: This is a reduced version of the map at a scale of 1:1,000,000, compiled and provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

Figure 6.1 – Zoning map of reference peak ground acceleration, a_gR, for the territory of Vietnam, 500-year return period for soil type A

NOTE: This is a reduced version of the Earthquake Zoning Map based on Short-Period Acceleration Response Spectrum S_S , for the territory of Vietnam at a scale of 1:1,000,000, 2,500-year return period for soil type B, compiled and provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

Figure 6.2 – Earthquake Zoning Map based on S_S Response Spectrum

NOTE: This is a reduced version of the Earthquake Zoning Map based on Long-Period Acceleration Response Spectrum S₁, for the territory of Vietnam at a scale of 1:1,000,000, 2,500-year return period for soil type B, compiled and provided by the Institute of Geophysics – Vietnam Academy of Science and Technology.

Figure 6.3 – Earthquake Zoning Map based on S₁ Response Spectrum

Table 6.1 – Table of earthquake zoning based on reference peak ground acceleration by administrative locality (500-year return period for soil type A), g = 9.81 m/s² (gravitational acceleration)

Location	Reference peak ground acceleration, a_gR	Location	Reference peak ground acceleration, a_gR
(1)	(2)	(3)	(4)
1. Ha Noi City
District Ba Dinh	0,10×g	Rural District Dan Phuong	0,12×g
District Cau Giay	0,10×g	Rural District Dong Anh	0,08×g
District Dong Da	0,10×g	Rural District Gia Lom	0,08×g
District Ha Dong	0,12×g	Rural District Hoai Duc	0,12×g
District Hai Ba Trung	0,10×g	Rural District Mo Linh	0,08×g
District Hoàn Kiem	0,10×g	Rural District My Duc	0,10×g
District Hoàng Mai	0,10×g	Rural District Phuc Tho	0,12×g
District Long Bien	0,08×g	Rural District Phu XuYen	0,12×g
District Tay Ho	0,10×g	Rural District Quoc Oai	0,12×g
District Thanh Xuon	0,12×g	Rural District Soc Son	0,10×g
District Bac Tu Liem	0,12×g	Rural District Thach That	0,12×g
District Nam Tu Liem	0,12×g	Rural District Thanh Oai	0,12×g
Town Son Tay	0,12×g	Rural District Thanh Tro	0,12×g
Rural District Ba Vo	0,12×g	Rural District Thuong Tin	0,12×g
Rural District Chuong My	0,12×g	Rural District Ung Hoa	0,12×g
2. Ho Chi Minh City
City Thu Duc	0,06×g	District 11	0,06×g
District 1	0,06×g	District 12	0,06×g
District 3	0,06×g	District Binh Thanh	0,06×g
District 4	0,06×g	District Binh Ton	0,06×g
District 5	0,06×g	District Gu Vap	0,06×g
District 6	0,06×g	District Phu NHoan	0,06×g
District 7	0,06×g	District Ton Binh	0,06×g
District 8	0,06×g	District Ton Phu	0,06×g
District 10	0,06×g	Rural District Binh Chong	0,06×g
Rural District Can Gio	0,06×g	Rural District Huc Mun	0,06×g
Rural District Cu Chi	0,06×g	Rural District NHa Bo	0,06×g
3. Hai Phong City
District Hong Bang	0,14×g	Rural District An Loo	0,14×g
District Duong Kinh	0,12×g	Rural District Bach Long Vi	0,04×g
District Do Son	0,10×g	Rural District Cot Hai	0,04×g
District Hai An	0,14×g	Rural District Kien Thuy	0,12×g
District Kien An	0,14×g	Rural District Thuy NguYen	0,12×g
District Lo Chon	0,14×g	Rural District Tien Long	0,10×g
District Ngu Quyen	0,14×g	Rural District Vinh Bao	0,08×g
Rural District An Duong	0,14×g
4. Da Nang City
District Cam Le	0,04×g	District Son Tra	0,08×g
District Hai Chau	0,08×g	District Thanh Kho	0,08×g
District Lien Chieu	0,06×g	Rural District Hoa Vang	0,04×g
District Ngu Hanh Son	0,06×g	Rural District Hoang Sa (District dao Hoang Sa)	0,04×g
5. Can Tho City
District Binh Thuy	0,04×g	Rural District Co Do	0,02×g
District Cai Rang	0,04×g	Rural District Phong Dien	0,02×g
District Ninh Kieu	0,04×g	Rural District Thai Lai	0,02×g
District e Mun	0,04×g	Rural District Vinh Thanh	0,02×g
District Thot Not	0,04×g
6. An Giang
City Long XuYen	0,04×g	Rural District An Phu	0,04×g
City Chau Doc	0,04×g	Rural District Chau Phu	0,04×g
Town Ton Chau	0,04×g	Rural District Chau Thanh	0,04×g
Rural District Cho Moi	0,04×g	Rural District Tri Tun	0,02×g
Rural District Phu Ton	0,04×g	Rural District Tinh Bien	0,04×g
Rural District Thoai Son	0,02×g
7. Ba Ria – Vung Tàu
City Vung Tàu	0,04×g	Rural District Dat Do	0,04×g
City Ba Ria	0,04×g	Rural District Long Dien	0,04×g
Rural District Chau Duc	0,02×g	Rural District Ton THanh	0,04×g
Rural District Con Dao	0,04×g	Rural District Xuyen Moc	0,02×g
8. Bac Lieu
City Bac Lieu	0,02×g	Rural District Hong Don	0,02×g
Rural District Dong Hai	0,02×g	Rural District Phuoc Long	0,02×g
Rural District Gia Rai	0,02×g	Rural District Vinh Loi	0,02×g
Rural District Hoa Binh	0,02×g
9. Bac Giang
City Bac Giang	0,10×g	Rural District Son Dong	0,04×g
Rural District Hiep Hoa	0,08×g	Rural District Ton Yen	0,06×g
Rural District Lang Giang	0,08×g	Rural District Viet Yen	0,12×g
Rural District Luc Nam	0,10×g	Rural District Yen Dung	0,10×g
Rural District Luc Ngan	0,06×g	Rural District Yen The	0,06×g
10. Bac Kan
City Bac Kan	0,08×g	Rural District Cho Moi	0,06×g
Rural District Ba Be	0,06×g	Rural District Na Ro	0,04×g
Rural District Bach Thung	0,08×g	Rural District Ngan Son	0,04×g
Rural District Cho Don	0,04×g	Rural District Poc Nam	0,06×g
11. Bac Ninh
City Bac Ninh	0,12×g	City Tu Son	0,08×g
Rural District Gia Binh	0,14×g	Rural District Thoan THanh	0,10×g
Rural District Luong Tai	0,12×g	Rural District Tien Du	0,10×g
Rural District Que Vu	0,12×g	Rural District Yen Phong	0,10×g
12. Ben Tre
City Ben Tre	0,02×g	Rural District Giong Trom	0,02×g
Rural District Ba Tri	0,02×g	Rural District Mo Cày Bac	0,02×g
Rural District Binh Dai	0,02×g	Rural District Mo Cày Nam	0,02×g
Rural District Chau Thanh	0,02×g	Rural District Thanh Phu	0,02×g
Rural District Cho Loch	0,02×g
13. Binh Duong
City Thu Dau Mot	0,04×g	Rural District Bau Bang	0,04×g
Town Ben Cot	0,04×g	Rural District Bac Ton UYen	0,02×g
Town Di An	0,04×g	Rural District Dau Tieng	0,04×g
Town Ton UYen	0,02×g	Rural District Phu Giao	0,04×g
Town Thoan An	0,06×g
14. Binh Dinh
City Quy Nhon	0,10×g	Rural District Phu My	0,10×g
Town An Nhon	0,10×g	Rural District Tay Son	0,10×g
Rural District An Loo	0,10×g	Rural District Tuy Phuoc	0,10×g
Rural District Hoai An	0,10×g	Rural District Von Canh	0,10×g
Rural District Hoai Nhon	0,10×g	Rural District Vinh Thanh	0,10×g
Rural District Phu Cot	0,10×g
15. Binh Phuoc
City Dong Xoai	0,02×g	Rural District Bu Dang	0,02×g
Town Binh Long	0,02×g	Rural District Bu Dop	0,02×g
Town Phuoc Long	0,02×g	Rural District Bu Gia Map	0,02×g
Rural District Chon Thanh	0,02×g	Rural District Hon District	0,02×g
Rural District Dong Phu	0,04×g	Rural District Loc Ninh	0,02×g
16. Binh Thoan
City Phan Thiet	0,04×g	Rural District Ham Thoan Nam	0,02×g
Town La Gi	0,04×g	Rural District Ham Thoan Bac	0,02×g
Rural District Bac Binh	0,02×g	Rural District Phu Quy	0,06×g
Rural District Duc Linh	0,02×g	Rural District Tonh Linh	0,02×g
Rural District Ham Ton	0,02×g	Rural District Tuy Phong	0,04×g
17. Cà Mau
City Cà Mau	0,02×g	Rural District Phu Ton	0,02×g
Rural District Cai Nuoc	0,02×g	Rural District U Minh	0,02×g
Rural District Dam Doi	0,02×g	Rural District Tran Van Thai	0,02×g
Rural District Nam Can	0,02×g	Rural District Thai Binh	0,02×g
Rural District Ngoc Hien	0,04×g
18. Cao Bang
City Cao Bang	0,04×g	Rural District Phuc Hoa	0,04×g
Rural District Bao Lac	0,04×g	Rural District Quang UYen	0,04×g
Rural District Bao Lom	0,06×g	Rural District Thach An	0,04×g
Rural District Ha Lang	0,02×g	Rural District Thung Nung	0,04×g
Rural District Ha Quang	0,06×g	Rural District Tra Linh	0,04×g
Rural District Hoa An	0,04×g	Rural District Trung Khonh	0,06×g
Rural District NguYen Binh	0,04×g
19. Dak Lak
City Buun Ma Thuot	0,04×g	Rural District Cu Kuin	0,04×g
Town Buun Ho	0,04×g	Rural District Cu M’gar	0,04×g
Rural District Buon Don	0,02×g	Rural District Ea H’leo	0,04×g
Rural District Ea Kar	0,04×g	Rural District Krong Nang	0,04×g
Rural District Ea Syp	0,04×g	Rural District Krung Pac	0,04×g
Rural District Krung A Na	0,02×g	Rural District Lak	0,04×g
Rural District Krung Bung	0,04×g	Rural District M’Drak	0,06×g
Rural District Krung Byk	0,04×g
20. Dak Nong
City Gia Nghia	0,04×g	Rural District Dak Song	0,02×g
Rural District Cu Jut	0,02×g	Rural District Dak Glong	0,04×g
Rural District Dak Mil	0,02×g	Rural District Krung Nu	0,02×g
Rural District Dak R’Lap	0,02×g	Rural District Tuy Duc	0,02×g
21. Dien Bien
City Dien Bien Phu	0,18×g	Rural District Muong Cha	0,20×g
Town Muong Lay	0,20×g	Rural District Muong Nhe	0,16×g
Rural District Dien Bien	0,14×g	Rural District Nam Po	0,16×g
Rural District Dien Bien Dong	0,14×g	Rural District Tuan Giao	0,20×g
Rural District Muong Ang	0,14×g	Rural District Tua CHoa	0,20×g
22. Dong Nai
City Bien Hoa	0,04×g	Rural District Ton Phu	0,02×g
Town Long Khonh	0,02×g	Rural District Thong Nhat	0,02×g
Rural District Cam My	0,02×g	Rural District Trang Bom	0,02×g
Rural District Dinh District	0,02×g	Rural District Vinh Cuu	0,02×g
Rural District Long THanh	0,04×g	Rural District Xuon Loc	0,02×g
Rural District Nhon Trach	0,04×g
23. Dong Thap
City Cao Lonh	0,02×g	Town Hong Ngu	0,02×g
City Sa Dec	0,04×g	Rural District Cao Lonh	0,02×g
Rural District Chau Thanh	0,02×g	Rural District Tam Nung	0,02×g
Rural District Hong Ngu	0,04×g	Rural District Ton Hong	0,02×g
Rural District Lai Vung	0,04×g	Rural District Thanh Binh	0,02×g
Rural District Lap Vu	0,04×g	Rural District Thap Muoi	0,02×g
24. Gia Lai
City Pleiku	0,04×g	Rural District Dak Doa	0,04×g
Town An Kho	0,08×g	Rural District Krung Pa	0,08×g
Town Ayun Pa	0,06×g	Rural District Kung Chro	0,08×g
Rural District Chu Se	0,04×g	Rural District KBang	0,08×g
Rural District Chu Puh	0,06×g	Rural District Ia Grai	0,04×g
Rural District Chu Prong	0,04×g	Rural District Ia Pa	0,06×g
Rural District Chu Pah	0,06×g	Rural District Mang Yang	0,06×g
Rural District Dak Po	0,08×g	Rural District Phu Thien	0,06×g
Rural District Duc Co	0,06×g
25. Ha Giang
City Ha Giang	0,04×g	Rural District Quang Binh	0,06×g
Rural District Bac Mo	0,04×g	Rural District District Ba	0,04×g
Rural District Bac Quang	0,04×g	Rural District Vi XuYen	0,04×g
Rural District Dong Van	0,04×g	Rural District Xon Man	0,04×g
Rural District Hoàng Su Pho	0,04×g	Rural District Yen Minh	0,06×g
Rural District Moo Vac	0,04×g
26. Ha Nam
City Phu Ly	0,14×g	Rural District Kim Bang	0,14×g
Town Duy Tien	0,14×g	Rural District Ly Nhon	0,14×g
Rural District Binh Luc	0,14×g	Rural District Thanh Liem	0,14×g
27. Ha Tinh
City Ha Tinh	0,12×g	Rural District Huong Son	0,10×g
Town Hong Linh	0,12×g	Rural District Huong Khe	0,08×g
Town Ky Anh	0,10×g	Rural District Loc Ha	0,12×g
Rural District Can Loc	0,12×g	Rural District Nghi Xuon	0,12×g
Rural District Cam XuYen	0,12×g	Rural District Thach Ha	0,12×g
Rural District Duc Tho	0,12×g	Rural District Vu Quang	0,10×g
28. Hai Duong
City Hai Duong	0,14×g	Rural District Kim THanh	0,14×g
City Cho Linh	0,12×g	Rural District Ninh Giang	0,06×g
Town Kinh Mun	0,12×g	Rural District Nam Soch	0,14×g
Rural District Binh Giang	0,06×g	Rural District Thanh Ha	0,14×g
Rural District Cam Giàng	0,10×g	Rural District Thanh Mien	0,06×g
Rural District Gia Loc	0,10×g	Rural District Tu Ky	0,12×g
29. Hau Giang
City Vi Thanh	0,02×g	Rural District Long My	0,02×g
Town Ngo Bay	0,02×g	Rural District Phung Hiep	0,02×g
Rural District Chau Thanh	0,04×g	Rural District Vi Thuy	0,02×g
Rural District Chau Thanh A	0,02×g
30. Hoa Binh
City Hoa Binh	0,08×g	Rural District Lac Thuy	0,08×g
Rural District Cao Phong	0,08×g	Rural District Luong Son	0,08×g
Rural District Da Bac	0,08×g	Rural District Mai Chau	0,16×g
Rural District Kim Bui	0,06×g	Rural District Ton Lac	0,12×g
Rural District Lac Son	0,16×g	Rural District Yen Thuy	0,14×g
31. Hung Yen
City Hung Yen	0,14×g	Rural District Phu Cu	0,08×g
Rural District Ân Thi	0,08×g	Rural District Tien Lu	0,12×g
Rural District Kim Dong	0,12×g	Rural District Van Giang	0,08×g
Rural District Khooi Chau	0,12×g	Rural District Van Lam	0,08×g
Rural District My Hao	0,08×g	Rural District Yen My	0,08×g
32. Khonh Hoa
City Nha Trang	0,04×g	Rural District Khanh Son	0,04×g
City Cam Ranh	0,04×g	Rural District Khonh Vinh	0,04×g
Town Ninh Hoa	0,04×g	Rural District Truong Sa (District dao Truong Sa)	0,02×g
Rural District Cam Lom	0,04×g	Rural District Van Ninh	0,04×g
Rural District Dien Khanh	0,04×g
33. Kien Giang
City Rach Gia	0,02×g	Rural District Giang THanh	0,02×g
City Phu Quoc	0,02×g	Rural District Gu Quao	0,02×g
Town Ha Tien	0,02×g	Rural District Hun Dat	0,02×g
Rural District An Bien	0,02×g	Rural District Kien Hai	0,02×g
Rural District An Minh	0,02×g	Rural District Kien Luong	0,02×g
Rural District Chau Thanh	0,02×g	Rural District Ton Hiep	0,02×g
Rural District Giong Rieng	0,02×g	Rural District Vinh Thoan	0,02×g
34. Kon Tum
City Kon Tum	0,06×g	Rural District Kon Plung	0,08×g
Rural District Dak Ha	0,06×g	Rural District Ngoc Hoi	0,08×g
Rural District Dak To	0,08×g	Rural District Sa Thay	0,08×g
Rural District Dak Glei	0,08×g	Rural District Tu Mo Rong	0,08×g
Rural District Kon Ray	0,08×g	Rural District Ia H’Drai	0,10×g
35. Lai Chau
City Lai Chau	0,12×g	Rural District Son Ho	0,18×g
Rural District Muong Te	0,12×g	Rural District Ton UYen	0,10×g
Rural District Nam Nhun	0,16×g	Rural District Tam Duong	0,10×g
Rural District Phong Tho	0,14×g	Rural District Than UYen	0,10×g
36. Lang Son
City Lang Son	0,04×g	Rural District Huu Lung	0,08×g
Rural District Binh Gia	0,04×g	Rural District Loc Binh	0,06×g
Rural District Bac Son	0,04×g	Rural District Trang Dinh	0,06×g
Rural District Cao Loc	0,04×g	Rural District Van Long	0,06×g
Rural District Chi Lang	0,04×g	Rural District Van District	0,04×g
Rural District Dinh Lap	0,04×g
37. Lao Cai
City Lao Cai	0,14×g	Rural District Bot Xot	0,12×g
Town Sa Pa	0,08×g	Rural District Muong Khuong	0,04×g
Rural District Bac Ha	0,06×g	Rural District Si Ma Cai	0,04×g
Rural District Bao Yen	0,14×g	Rural District Van Ban	0,10×g
Rural District Bao Thang	0,14×g
38. Lam Dong
City Da Lat	0,02×g	Rural District Don Duong	0,04×g
City Bao Loc	0,02×g	Rural District Duc Trong	0,04×g
Rural District Bao Lom	0,02×g	Rural District Da Huoai	0,02×g
Rural District Cot Tien	0,04×g	Rural District Da Teh	0,02×g
Rural District Di Linh	0,02×g	Rural District Lom Ha	0,02×g
Rural District Dam Rong	0,02×g	Rural District Lac Duong	0,02×g
39. Long An
City Ton An	0,02×g	Rural District Moc Hoa	0,02×g
Town Kien Tuong	0,02×g	Rural District Tan Hung	0,02×g
Rural District Ben Luc	0,04×g	Rural District Ton Thanh	0,02×g
Rural District Can Duoc	0,04×g	Rural District Ton Tru	0,04×g
Rural District Can Giuoc	0,04×g	Rural District Thanh Hoa	0,02×g
Rural District Chau Thanh	0,02×g	Rural District Thu THoa	0,04×g
Rural District Duc Hoa	0,04×g	Rural District Vinh Hung	0,02×g
Rural District Duc Hue	0,04×g
40. Nam Dinh
City Nam Dinh	0,14×g	Rural District Nghia Hung	0,14×g
Rural District Giao Thuy	0,12×g	Rural District Truc Ninh	0,14×g
Rural District Hai Hau	0,14×g	Rural District Vu Ban	0,14×g
Rural District My Loc	0,14×g	Rural District Xuan Truong	0,14×g
Rural District Nam Truc	0,14×g	Rural District i Yen	0,12×g
41. Nghe An
City Vinh	0,12×g	Rural District Nam Dan	0,12×g
Town Cua Lu	0,12×g	Rural District Nghia Dan	0,10×g
Town Hoàng Mai	0,10×g	Rural District Que Phong	0,08×g
Town Thai Hoa	0,10×g	Rural District Quy Hop	0,08×g
Rural District Anh Son	0,10×g	Rural District Quynh Luu	0,10×g
Rural District Con Cuung	0,10×g	Rural District Quy Chau	0,08×g
Rural District Dien Chau	0,10×g	Rural District Ton Ky	0,10×g
Rural District Do Luong	0,12×g	Rural District Thanh Chuong	0,12×g
Rural District Hung Nguyen	0,12×g	Rural District Tuong Duong	0,08×g
Rural District Ky Son	0,06×g	Rural District Yen THanh	0,10×g
Rural District Nghi Loc	0,12×g
42. Ninh Binh
City Ninh Binh	0,12×g	Rural District Kim Son	0,12×g
Town Tam Diep	0,12×g	Rural District Nho District	0,12×g
Rural District Gia Vien	0,08×g	Rural District Yen Khonh	0,12×g
Rural District Hoa Lu	0,10×g	Rural District Yen Mu	0,12×g
43. Ninh Thoan
City Phan Rang-Thop CHam	0,02×g	Rural District Ninh Son	0,02×g
Rural District Boc Ái	0,02×g	Rural District Thoan Bac	0,02×g
Rural District Ninh Hai	0,02×g	Rural District Thoan Nam	0,02×g
Rural District Ninh Phuoc	0,02×g
44. Phu Tho
City Viet Tro	0,14×g	Rural District Tam Nung	0,12×g
Town Phu Tho	0,14×g	Rural District Tan Son	0,08×g
Rural District Cam Kho	0,12×g	Rural District Thanh Ba	0,14×g
Rural District Doan Hung	0,12×g	Rural District Thanh Son	0,08×g
Rural District Ha Hoa	0,12×g	Rural District Thanh Thuy	0,08×g
Rural District Lom Thao	0,14×g	Rural District Yen Lap	0,08×g
Rural District Phu Ninh	0,14×g
45. Phu Yen
City Tuy Hoa	0,10×g	Rural District Sung Hinh	0,08×g
Town Sung Cau	0,10×g	Rural District Son Hoa	0,10×g
Rural District Dong Hoa	0,08×g	Rural District Tay Hoa	0,10×g
Rural District Dong Xuan	0,10×g	Rural District Tuy An	0,10×g
Rural District Phu Hoa	0,10×g
46. Quang Binh
City Dong Hoi	0,04×g	Rural District Minh Hoa	0,06×g
Town Ba Don	0,08×g	Rural District Quang Ninh	0,04×g
Rural District Bo Trach	0,06×g	Rural District Quang Trach	0,08×g
Rural District Le Thuy	0,04×g	Rural District Tuyen Hoa	0,08×g
47. Quang Nam
City Tam Ky	0,08×g	Rural District Nam Giang	0,04×g
City Hoi An	0,04×g	Rural District Nong Son	0,06×g
Town Dien Ban	0,04×g	Rural District Nyi THanh	0,06×g
Rural District Bac Tra My	0,06×g	Rural District Phu Ninh	0,08×g
Rural District Duy XuYen	0,04×g	Rural District Phuoc Son	0,10×g
Rural District Dai Loc	0,04×g	Rural District Que Son	0,08×g
Rural District Dong Giang	0,04×g	Rural District Tay Giang	0,06×g
Rural District Hiep Duc	0,10×g	Rural District Thang Binh	0,06×g
Rural District Nam Tra My	0,06×g	Rural District Tien Phuoc	0,06×g
48. Quang Ngai
City Quang Ngai	0,08×g	Rural District Nghia Hanh	0,06×g
Rural District Ba To	0,10×g	Rural District Son Ha	0,06×g
Rural District Binh Son	0,08×g	Rural District Son Tay	0,04×g
Rural District Duc Pho	0,10×g	Rural District Son Tinh	0,08×g
Rural District Ly Son	0,08×g	Rural District Tay Tra	0,08×g
Rural District Minh Long	0,06×g	Rural District Tra Bong	0,08×g
Rural District Mo Duc	0,06×g	Rural District Tu Nghia	0,08×g
49. Quang Ninh
City Ha Long	0,10×g	City Mung Coi	0,06×g
City Cam Pha	0,08×g	City Uung Bo	0,12×g
Town Quang Yen	0,12×g	Rural District Dong Trieu	0,12×g
Rural District Ba Che	0,10×g	Rural District Hai Ha	0,04×g
Rural District Binh Lieu	0,04×g	Rural District Tien Yen	0,06×g
Rural District Cu Tu	0,02×g	Rural District Van Don	0,06×g
Rural District Dam Ha	0,04×g
50. Quang Tri
City Dong Ha	0,04×g	Rural District Gio Linh	0,04×g
Town Quang Tri	0,04×g	Rural District Huong Hoa	0,04×g
Rural District Cam Lo	0,04×g	Rural District Hai Lang	0,04×g
Rural District Con Co	0,06×g	Rural District Trieu Phong	0,04×g
Rural District Da Krong	0,04×g	Rural District Vinh Linh	0,04×g
51. Soc Trang
City Soc Trang	0,02×g	Rural District Long Phu	0,04×g
Town Vinh Chau	0,02×g	Rural District My Ty	0,02×g
Town Ngo Nam	0,02×g	Rural District My XuYen	0,02×g
Rural District Chau Thanh	0,02×g	Rural District Thanh Tri	0,02×g
Rural District Cu Lao Dung	0,04×g	Rural District Tran De	0,02×g
Rural District Ke Soch	0,04×g
52. Son La
City Son La	0,18×g	Rural District Quynh Nhai	0,12×g
Rural District Bac Yen	0,08×g	Rural District Sung Mo	0,14×g
Rural District Mai Son	0,18×g	Rural District Sop Cop	0,12×g
Rural District Moc Chau	0,22×g	Rural District Thoan Chau	0,22×g
Rural District Muong La	0,10×g	Rural District Von Ho	0,20×g
Rural District Phu Yen	0,08×g	Rural District Yen Chau	0,20×g
53. Tay Ninh
City Tay Ninh	0,04×g	Rural District Hoa THanh	0,04×g
Rural District Ben Cau	0,06×g	Rural District Ton Bien	0,04×g
Rural District Chau Thanh	0,04×g	Rural District Ton Chau	0,04×g
Rural District Duong Minh Chau	0,04×g	Rural District Trang Bang	0,04×g
Rural District Gu Dau	0,04×g
54. Thai Binh
City Thai Binh	0,12×g	Rural District Quynh Phu	0,06×g
Rural District Dong Hung	0,08×g	Rural District Thai Thuy	0,06×g
Rural District Hung Ha	0,12×g	Rural District Tien Hai	0,08×g
Rural District Kien Xuong	0,10×g	Rural District Vu Thu	0,12×g
55. Thai NguYen
City Thai NguYen	0,08×g	Rural District Dong Hy	0,10×g
City Pho Yen	0,08×g	Rural District Phu Binh	0,06×g
Town Sung Cung	0,08×g	Rural District Phu Luong	0,10×g
Rural District Dai Tu	0,12×g	Rural District Vu Nhai	0,04×g
Rural District Dinh Hoa	0,04×g
56. Thanh Hoa
City Thanh Hoa	0,14×g	Rural District Hau Loc	0,20×g
City Sam Son	0,12×g	Rural District Hoang Hoa	0,20×g
Town Bim Son	0,18×g	Rural District Lang Chong	0,12×g
Town Nghi Son	0,12×g	Rural District Muong Lat	0,14×g
Rural District Ba Thuoc	0,18×g	Rural District Nga Son	0,16×g
Rural District Cam Thuy	0,20×g	Rural District Ngoc Lac	0,12×g
Rural District Dong Son	0,12×g	Rural District Nhu Thanh	0,12×g
Rural District Ha Trung	0,22×g	Rural District Nhu Xuan	0,10×g
Rural District Nung Cong	0,12×g	Rural District Trieu Son	0,12×g
Rural District District Hoa	0,14×g	Rural District Thuong Xuan	0,12×g
Rural District District Son	0,10×g	Rural District Tho Xuon	0,12×g
Rural District Quang Xuong	0,12×g	Rural District Vinh Loc	0,22×g
Rural District Thach THanh	0,20×g	Rural District Yen Dinh	0,18×g
Rural District Thieu Hoa	0,14×g
57. Thua Thien – Hue
City Hue	0,06×g	Rural District Phong Dien	0,06×g
Town Huong Thuy	0,08×g	Rural District Phu Loc	0,04×g
Town Huong Tra	0,06×g	Rural District Phu Vang	0,08×g
Rural District A Luoi	0,04×g	Rural District Quang Dien	0,06×g
Rural District Nam Dong	0,08×g
58. Tien Giang
City My Tho	0,02×g	Rural District Cho Gao	0,02×g
Town Cai Lay	0,02×g	Rural District Gu Cung Tay	0,04×g
Town Gu Cung	0,04×g	Rural District Gu Cung Dong	0,04×g
Rural District Coi Bo	0,02×g	Rural District Tan Phuoc	0,02×g
Rural District Cai Lay	0,02×g	Rural District Tan Phu Dong	0,04×g
Rural District Chau Thanh	0,02×g
59. Tra Vinh
City Tra Vinh	0,02×g	Rural District Chau Thanh	0,02×g
Town DuYen Hai	0,04×g	Rural District DuYen Hai	0,04×g
Rural District Càng Long	0,02×g	Rural District Tra Cy	0,04×g
Rural District Cau Ko	0,04×g	Rural District Tieu Can	0,04×g
Rural District Cau Ngang	0,02×g
60. Tuyen Quang
City Tuyen Quang	0,06×g	Rural District Na Hang	0,04×g
Rural District Chiem Hoa	0,04×g	Rural District Son Duong	0,06×g
Rural District Ham Yen	0,06×g	Rural District Yen Son	0,08×g
Rural District Lom Binh	0,04×g
61. Vinh Long
City Vinh Long	0,02×g	Rural District Tam Binh	0,04×g
Town Binh Minh	0,04×g	Rural District Tra en	0,04×g
Rural District Long Ho	0,02×g	Rural District Vung Liem	0,02×g
Rural District Mang Thot	0,02×g	Rural District Binh Ton	0,04×g
62. Vinh Phuc
City Vinh Yen	0,10×g	Rural District Tam Duong	0,08×g
City Phuc Yen	0,08×g	Rural District Tam Dao	0,08×g
Rural District Binh XuYen	0,08×g	Rural District Vinh Tuong	0,14×g
Rural District Lap Thach	0,10×g	Rural District Yen Lac	0,12×g
Rural District Sung Lu	0,12×g
63. Yen Bai
City Yen Bai	0,14×g	Rural District Tran Yen	0,14×g
Town Nghia Lo	0,08×g	Rural District Van Chan	0,08×g
Rural District Luc Yen	0,10×g	Rural District Van Yen	0,14×g
Rural District Mu Cang Chai	0,08×g	Rural District Yen Binh	0,14×g
Rural District Tram Tau	0,08×g

Table 6.2 – Table of earthquake zoning based on short-period response spectrum S_S and long-period response spectrum S₁ by administrative locality with a 2,500-year return period for soil type B

Location	Short-period response spectrum S_s	Long-period response spectrum S₁	Location	Short-period response spectrum S_s	Long-period response spectrum S₁
(1)	(2)	(3)	(4)	(5)	(6)
1. Ha Noi City
District Ba Dinh	0,36×g	0,14×g	Rural District Dan Phuong	0,39×g	0,17×g
District Cau Giay	0,37×g	0,15×g	Rural District Dong Anh	0,30×g	0,12×g
District Dong Da	0,36×g	0,16×g	Rural District Gia Lom	0,30×g	0,12×g
District Ha Dong	0,39×g	0,17×g	Rural District Hoai Duc	0,39×g	0,17×g
District Hai Ba Trung	0,35×g	0,16×g	Rural District Mo Linh	0,30×g	0,12×g
District Hoàn Kiem	0,32×g	0,15×g	Rural District My Duc	0,37×g	0,15×g
District Hoàng Mai	0,37×g	0,14×g	Rural District Phuc Tho	0,40×g	0,17×g
District Long Bien	0,30×g	0,12×g	Rural District Phu XuYen	0,40×g	0,19×g
District Tay Ho	0,32×g	0,15×g	Rural District Quoc Oai	0,40×g	0,17×g
District Thanh Xuon	0,38×g	0,17×g	Rural District Soc Son	0,38×g	0,15×g
District Bac Tu Liem	0,38×g	0,19×g	Rural District Thach That	0,40×g	0,18×g
District Nam Tu Liem	0,38×g	0,18×g	Rural District Thanh Oai	0,40×g	0,18×g
Town Son Tay	0,40×g	0,17×g	Rural District Thanh Tro	0,38×g	0,17×g
Rural District Ba Vo	0,40×g	0,19×g	Rural District Thuong Tin	0,39×g	0,19×g
Rural District Chuong My	0,40×g	0,17×g	Rural District Ung Hoa	0,39×g	0,18×g
2. Ho Chi Minh City
City Thu Duc	0,23×g	0,08×g	District 11	0,23×g	0,08×g
District 1	0,23×g	0,08×g	District 12	0,23×g	0,08×g
District 3	0,23×g	0,08×g	District Binh Thanh	0,23×g	0,08×g
District 4	0,23×g	0,08×g	District Binh Ton	0,23×g	0,08×g
District 5	0,23×g	0,08×g	District Gu Vap	0,23×g	0,08×g
District 6	0,23×g	0,08×g	District Phu NHoan	0,23×g	0,08×g
District 7	0,23×g	0,08×g	District Ton Binh	0,23×g	0,08×g
District 8	0,23×g	0,08×g	District Ton Phu	0,23×g	0,08×g
District 10	0,23×g	0,08×g	Rural District Binh Chong	0,23×g	0,08×g
Rural District Can Gio	0,23×g	0,08×g	Rural District Huc Mun	0,23×g	0,08×g
Rural District Cu Chi	0,23×g	0,08×g	Rural District NHa Bo	0,23×g	0,08×g
3. Hai Phong City
District Hong Bang	0,53×g	0,22×g	Rural District An Loo	0,53×g	0,21×g
District Duong Kinh	0,45×g	0,19×g	Rural District Bach Long Vi	0,15×g	0,06×g
District Do Son	0,38×g	0,15×g	Rural District Cot Hai	0,15×g	0,06×g
District Hai An	0,53×g	0,20×g	Rural District Kien Thuy	0,45×g	0,18×g
District Kien An	0,53×g	0,22×g	Rural District Thuy NguYen	0,45×g	0,17×g
District Lo Chon	0,53×g	0,20×g	Rural District Tien Long	0,38×g	0,15×g
District Ngu Quyen	0,53×g	0,20×g	Rural District Vinh Bao	0,30×g	0,12×g
Rural District An Duong	0,53×g	0,20×g
4. Da Nang City
District Cam Le	0,14×g	0,06×g	District Son Tra	0,30×g	0,12×g
District Hai Chau	0,30×g	0,12×g	District Thanh Kho	0,30×g	0,12×g
District Lien Chieu	0,23×g	0,09×g	Rural District Hoa Vang	0,15×g	0,06×g
District Ngu Hanh Son	0,23×g	0,09×g	Rural District Hoang Sa (District dao Hoang Sa)	0,15×g	0,06×g
5. Can Tho City
District Binh Thuy	0,13×g	0,06×g	Rural District Co Do	0,08×g	0,03×g
District Cai Rang	0,15×g	0,06×g	Rural District Phong Dien	0,08×g	0,03×g
District Ninh Kieu	0,12×g	0,06×g	Rural District Thai Lai	0,08×g	0,03×g
District e Mun	0,15×g	0,06×g	Rural District Vinh Thanh	0,08×g	0,03×g
District Thot Not	0,13×g	0,06×g
6. An Giang
City Long XuYen	0,13×g	0,06×g	Rural District An Phu	0,15×g	0,06×g
City Chau Doc	0,13×g	0,06×g	Rural District Chau Phu	0,13×g	0,06×g
Town Ton Chau	0,15×g	0,06×g	Rural District Chau Thanh	0,13×g	0,06×g
Rural District Cho Moi	0,15×g	0,06×g	Rural District Tri Tun	0,08×g	0,03×g
Rural District Phu Ton	0,13×g	0,06×g	Rural District Tinh Bien	0,15×g	0,06×g
Rural District Thoai Son	0,08×g	0,03×g
7. Ba Ria – Vung Tàu
City Vung Tàu	0,15×g	0,06×g	Rural District Dat Do	0,15×g	0,06×g
City Ba Ria	0,15×g	0,06×g	Rural District Long Dien	0,15×g	0,06×g
Rural District Chau Duc	0,08×g	0,03×g	Rural District Ton THanh	0,15×g	0,06×g
Rural District Con Dao	0,15×g	0,06×g	Rural District Xuyen Moc	0,06×g	0,03×g
8. Bac Lieu
City Bac Lieu	0,08×g	0,03×g	Rural District Hong Don	0,08×g	0,03×g
Rural District Dong Hai	0,08×g	0,03×g	Rural District Phuoc Long	0,08×g	0,03×g
Rural District Gia Rai	0,08×g	0,03×g	Rural District Vinh Loi	0,08×g	0,03×g
Rural District Hoa Binh	0,08×g	0,03×g
9. Bac Giang
City Bac Giang	0,38×g	0,14×g	Rural District Son Dong	0,12×g	0,06×g
Rural District Hiep Hoa	0,30×g	0,11×g	Rural District Ton Yen	0,23×g	0,09×g
Rural District Lang Giang	0,30×g	0,12×g	Rural District Viet Yen	0,45×g	0,18×g
Rural District Luc Nam	0,38×g	0,16×g	Rural District Yen Dung	0,38×g	0,15×g
Rural District Luc Ngan	0,23×g	0,09×g	Rural District Yen The	0,23×g	0,09×g
10. Bac Kan
City Bac Kan	0,30×g	0,12×g	Rural District Cho Moi	0,19×g	0,09×g
Rural District Ba Be	0,23×g	0,10×g	Rural District Na Ro	0,15×g	0,06×g
Rural District Bach Thung	0,30×g	0,13×g	Rural District Ngan Son	0,15×g	0,06×g
Rural District Cho Don	0,15×g	0,06×g	Rural District Poc Nam	0,19×g	0,09×g
11. Bac Ninh
City Bac Ninh	0,45×g	0,18×g	Town Tu Son	0,30×g	0,12×g
Rural District Gia Binh	0,53×g	0,21×g	Rural District Thoan THanh	0,38×g	0,15×g
Rural District Luong Tai	0,45×g	0,19×g	Rural District Tien Du	0,38×g	0,14×g
Rural District Que Vu	0,45×g	0,17×g	Rural District Yen Phong	0,38×g	0,14×g
12. Ben Tre
City Ben Tre	0,08×g	0,03×g	Rural District Giong Trom	0,08×g	0,03×g
Rural District Ba Tri	0,08×g	0,03×g	Rural District Mo Cày Bac	0,08×g	0,03×g
Rural District Binh Dai	0,08×g	0,03×g	Rural District Mo Cày Nam	0,08×g	0,03×g
Rural District Chau Thanh	0,08×g	0,03×g	Rural District Thanh Phu	0,08×g	0,03×g
Rural District Cho Loch	0,08×g	0,03×g
13. Binh Duong
City Thu Dau Mot	0,15×g	0,06×g	Rural District Bau Bang	0,13×g	0,06×g
Town Ben Cot	0,12×g	0,06×g	Rural District Bac Ton UYen	0,08×g	0,03×g
Town Di An	0,13×g	0,06×g	Rural District Dau Tieng	0,13×g	0,06×g
Town Ton UYen	0,08×g	0,03×g	Rural District Phu Giao	0,13×g	0,06×g
Town Thoan An	0,23×g	0,09×g
14. Binh Dinh
City Quy Nhon	0,19×g	0,09×g	Rural District Phu My	0,20×g	0,09×g
Town An Nhon	0,18×g	0,09×g	Rural District Tay Son	0,20×g	0,09×g
Rural District An Loo	0,23×g	0,08×g	Rural District Tuy Phuoc	0,23×g	0,09×g
Rural District Hoai An	0,19×g	0,09×g	Rural District Von Canh	0,23×g	0,10×g
Rural District Hoai Nhon	0,19×g	0,09×g	Rural District Vinh Thanh	0,21×g	0,09×g
Rural District Phu Cot	0,19×g	0,09×g
15. Binh Phuoc
City Dong Xoai	0,08×g	0,03×g	Rural District Bu Dang	0,08×g	0,03×g
Town Binh Long	0,08×g	0,03×g	Rural District Bu Dop	0,08×g	0,03×g
Town Phuoc Long	0,08×g	0,03×g	Rural District Bu Gia Map	0,08×g	0,03×g
Rural District Chon Thanh	0,08×g	0,03×g	Rural District Hon District	0,08×g	0,03×g
Rural District Dong Phu	0,15×g	0,06×g	Rural District Loc Ninh	0,08×g	0,03×g
16. Binh Thoan
City Phan Thiet	0,08×g	0,03×g	Rural District Ham Thoan Nam	0,08×g	0,03×g
Town La Gi	0,15×g	0,06×g	Rural District Ham Thoan Bac	0,08×g	0,03×g
Rural District Bac Binh	0,08×g	0,03×g	Rural District Phu Quy	0,19×g	0,09×g
Rural District Duc Linh	0,08×g	0,03×g	Rural District Tonh Linh	0,08×g	0,03×g
Rural District Ham Ton	0,08×g	0,03×g	Rural District Tuy Phong	0,15×g	0,06×g
17. Cà Mau
City Cà Mau	0,08×g	0,03×g	Rural District Phu Ton	0,08×g	0,03×g
Rural District Cai Nuoc	0,08×g	0,03×g	Rural District U Minh	0,08×g	0,03×g
Rural District Dam Doi	0,08×g	0,03×g	Rural District Tran Van Thai	0,08×g	0,03×g
Rural District Nam Can	0,08×g	0,03×g	Rural District Thai Binh	0,08×g	0,03×g
Rural District Ngoc Hien	0,15×g	0,06×g
18. Cao Bang
City Cao Bang	0,17×g	0,06×g	Rural District Phuc Hoa	0,15×g	0,06×g
Rural District Bao Lac	0,15×g	0,06×g	Rural District Quang UYen	0,15×g	0,06×g
Rural District Bao Lom	0,23×g	0,09×g	Rural District Thach An	0,17×g	0,06×g
Rural District Ha Lang	0,08×g	0,03×g	Rural District Thung Nung	0,15×g	0,06×g
Rural District Ha Quang	0,23×g	0,09×g	Rural District Tra Linh	0,15×g	0,06×g
Rural District Hoa An	0,17×g	0,06×g	Rural District Trung Khonh	0,23×g	0,09×g
Rural District NguYen Binh	0,15×g	0,06×g
19. Dak Lak
City Buun Ma Thuot	0,08×g	0,03×g	Rural District Cu Kuin	0,08×g	0,03×g
Town Buun Ho	0,08×g	0,03×g	Rural District Cu M’gar	0,08×g	0,03×g
Rural District Buon Don	0,08×g	0,03×g	Rural District Ea H’leo	0,08×g	0,03×g
Rural District Ea Kar	0,08×g	0,03×g	Rural District Krong Nang	0,08×g	0,03×g
Rural District Ea Syp	0,08×g	0,03×g	Rural District Krung Pac	0,08×g	0,03×g
Rural District Krung A Na	0,08×g	0,03×g	Rural District Lak	0,08×g	0,03×g
Rural District Krung Bung	0,08×g	0,03×g	Rural District M’Drak	0,08×g	0,03×g
Rural District Krung Byk	0,08×g	0,03×g
20. Dak Nong
City Gia Nghia	0,13×g	0,06×g	Rural District Dak Song	0,08×g	0,03×g
Rural District Cu Jut	0,08×g	0,03×g	Rural District Dak Glong	0,15×g	0,06×g
Rural District Dak Mil	0,08×g	0,03×g	Rural District Krung Nu	0,08×g	0,03×g
Rural District Dak R’Lap	0,08×g	0,03×g	Rural District Tuy Duc	0,08×g	0,03×g
21. Dien Bien
City Dien Bien Phu	0,68×g	0,26×g	Rural District Muong Cha	0,61×g	0,30×g
Town Muong Lay	0,61×g	0,31×g	Rural District Muong Nhe	0,60×g	0,23×g
Rural District Dien Bien	0,47×g	0,20×g	Rural District Nam Po	0,60×g	0,24×g
Rural District Dien Bien Dong	0,53×g	0,20×g	Rural District Tuan Giao	0,75×g	0,31×g
Rural District Muong Ang	0,43×g	0,21×g	Rural District Tua CHoa	0,75×g	0,31×g
22. Dong Nai
City Bien Hoa	0,15×g	0,06×g	Rural District Ton Phu	0,08×g	0,03×g
Town Long Khonh	0,08×g	0,03×g	Rural District Thong Nhat	0,08×g	0,03×g
Rural District Cam My	0,08×g	0,03×g	Rural District Trang Bom	0,08×g	0,03×g
Rural District Dinh District	0,08×g	0,03×g	Rural District Vinh Cuu	0,08×g	0,03×g
Rural District Long THanh	0,15×g	0,06×g	Rural District Xuon Loc	0,08×g	0,03×g
Rural District Nhon Trach	0,13×g	0,06×g
23. Dong Thap
City Cao Lonh	0,08×g	0,03×g	Town Hong Ngu	0,08×g	0,03×g
City Sa Dec	0,15×g	0,06×g	Rural District Cao Lonh	0,08×g	0,03×g
Rural District Chau Thanh	0,08×g	0,03×g	Rural District Tam Nung	0,08×g	0,03×g
Rural District Hong Ngu	0,15×g	0,06×g	Rural District Ton Hong	0,08×g	0,03×g
Rural District Lai Vung	0,13×g	0,06×g	Rural District Thanh Binh	0,08×g	0,03×g
Rural District Lap Vu	0,15×g	0,06×g	Rural District Thap Muoi	0,08×g	0,03×g
24. Gia Lai
City Pleiku	0,08×g	0,03×g	Rural District Dak Doa	0,08×g	0,03×g
Town An Kho	0,15×g	0,06×g	Rural District Krung Pa	0,08×g	0,03×g
Town Ayun Pa	0,08×g	0,03×g	Rural District Kung Chro	0,08×g	0,03×g
Rural District Chu Se	0,08×g	0,03×g	Rural District KBang	0,15×g	0,06×g
Rural District Chu Puh	0,08×g	0,03×g	Rural District Ia Grai	0,08×g	0,03×g
Rural District Chu Prong	0,08×g	0,03×g	Rural District Ia Pa	0,08×g	0,03×g
Rural District Chu Pah	0,08×g	0,03×g	Rural District Mang Yang	0,08×g	0,03×g
Rural District Dak Po	0,08×g	0,03×g	Rural District Phu Thien	0,08×g	0,03×g
Rural District Duc Co	0,08×g	0,03×g
25. Ha Giang
City Ha Giang	0,14×g	0,06×g	Rural District Quang Binh	0,23×g	0,09×g
Rural District Bac Mo	0,15×g	0,06×g	Rural District District Ba	0,15×g	0,06×g
Rural District Bac Quang	0,15×g	0,06×g	Rural District Vi XuYen	0,13×g	0,06×g
Rural District Dong Van	0,15×g	0,06×g	Rural District Xon Man	0,15×g	0,06×g
Rural District Hoàng Su Pho	0,15×g	0,06×g	Rural District Yen Minh	0,20×g	0,09×g
Rural District Moo Vac	0,15×g	0,06×g
26. Ha Nam
City Phu Ly	0,53×g	0,21×g	Rural District Kim Bang	0,53×g	0,22×g
Town Duy Tien	0,53×g	0,20×g	Rural District Ly Nhon	0,53×g	0,20×g
Rural District Binh Luc	0,53×g	0,20×g	Rural District Thanh Liem	0,53×g	0,21×g
27. Ha Tinh
City Ha Tinh	0,38×g	0,17×g	Rural District Huong Son	0,30×g	0,15×g
Town Hong Linh	0,38×g	0,18×g	Rural District Huong Khe	0,30×g	0,12×g
Town Ky Anh	0,37×g	0,15×g	Rural District Loc Ha	0,39×g	0,17×g
Rural District Can Loc	0,38×g	0,18×g	Rural District Nghi Xuon	0,38×g	0,17×g
Rural District Cam XuYen	0,37×g	0,18×g	Rural District Thach Ha	0,38×g	0,19×g
Rural District Duc Tho	0,37×g	0,17×g	Rural District Vu Quang	0,38×g	0,14×g
28. Hai Duong
City Hai Duong	0,53×g	0,22×g	Rural District Kim THanh	0,53×g	0,20×g
City Cho Linh	0,45×g	0,19×g	Rural District Ninh Giang	0,23×g	0,10×g
Town Kinh Mun	0,45×g	0,17×g	Rural District Nam Soch	0,53×g	0,21×g
Rural District Binh Giang	0,23×g	0,09×g	Rural District Thanh Ha	0,53×g	0,22×g
Rural District Cam Giàng	0,38×g	0,14×g	Rural District Thanh Mien	0,23×g	0,09×g
Rural District Gia Loc	0,38×g	0,15×g	Rural District Tu Ky	0,45×g	0,18×g
29. Hau Giang
City Vi Thanh	0,08×g	0,03×g	Rural District Long My	0,08×g	0,03×g
Town Ngo Bay	0,08×g	0,03×g	Rural District Phung Hiep	0,08×g	0,03×g
Rural District Chau Thanh	0,15×g	0,06×g	Rural District Vi Thuy	0,08×g	0,03×g
Rural District Chau Thanh A	0,08×g	0,03×g
30. Hoa Binh
City Hoa Binh	0,25×g	0,12×g	Rural District Lac Thuy	0,25×g	0,12×g
Rural District Cao Phong	0,30×g	0,12×g	Rural District Luong Son	0,24×g	0,12×g
Rural District Da Bac	0,27×g	0,12×g	Rural District Mai Chau	0,60×g	0,24×g
Rural District Kim Bui	0,19×g	0,09×g	Rural District Ton Lac	0,45×g	0,18×g
Rural District Lac Son	0,60×g	0,24×g	Rural District Yen Thuy	0,53×g	0,20×g
31. Hung Yen
City Hung Yen	0,53×g	0,21×g	Rural District Phu Cu	0,27×g	0,12×g
Rural District Ân Thi	0,28×g	0,11×g	Rural District Tien Lu	0,37×g	0,19×g
Rural District Kim Dong	0,38×g	0,18×g	Rural District Van Giang	0,28×g	0,12×g
Rural District Khooi Chau	0,37×g	0,18×g	Rural District Van Lam	0,30×g	0,12×g
Rural District My Hao	0,30×g	0,12×g	Rural District Yen My	0,24×g	0,12×g
32. Khonh Hoa
City Nha Trang	0,15×g	0,06×g	Rural District Khanh Son	0,15×g	0,06×g
City Cam Ranh	0,08×g	0,03×g	Rural District Khonh Vinh	0,15×g	0,06×g
Town Ninh Hoa	0,15×g	0,06×g	Rural District Truong Sa (District dao Truong Sa)	0,08×g	0,03×g
Rural District Cam Lom	0,15×g	0,06×g	Rural District Van Ninh	0,15×g	0,06×g
Rural District Dien Khanh	0,15×g	0,06×g
33. Kien Giang
City Rach Gia	0,08×g	0,03×g	Rural District Giang THanh	0,08×g	0,03×g
City Phu Quoc	0,08×g	0,03×g	Rural District Gu Quao	0,08×g	0,03×g
Town Ha Tien	0,08×g	0,03×g	Rural District Hun Dat	0,08×g	0,03×g
Rural District An Bien	0,08×g	0,03×g	Rural District Kien Hai	0,08×g	0,03×g
Rural District An Minh	0,08×g	0,03×g	Rural District Kien Luong	0,08×g	0,03×g
Rural District Chau Thanh	0,08×g	0,03×g	Rural District Ton Hiep	0,08×g	0,03×g
Rural District Giong Rieng	0,08×g	0,03×g	Rural District Vinh Thoan	0,08×g	0,03×g
34. Kon Tum
City Kon Tum	0,08×g	0,03×g	Rural District Kon Plung	0,08×g	0,03×g
Rural District Dak Ha	0,08×g	0,03×g	Rural District Ngoc Hoi	0,13×g	0,06×g
Rural District Dak To	0,08×g	0,03×g	Rural District Sa Thay	0,08×g	0,03×g
Rural District Dak Glei	0,14×g	0,06×g	Rural District Tu Mo Rong	0,08×g	0,03×g
Rural District Kon Ray	0,08×g	0,03×g	Rural District Ia H’Drai	0,13×g	0,03×g
35. Lai Chau
City Lai Chau	0,36×g	0,17×g	Rural District Son Ho	0,54×g	0,28×g
Rural District Muong Te	0,36×g	0,18×g	Rural District Ton UYen	0,32×g	0,14×g
Rural District Nam Nhun	0,51×g	0,24×g	Rural District Tam Duong	0,32×g	0,14×g
Rural District Phong Tho	0,45×g	0,20×g	Rural District Than UYen	0,38×g	0,16×g
36. Lang Son
City Lang Son	0,16×g	0,06×g	Rural District Huu Lung	0,30×g	0,13×g
Rural District Binh Gia	0,15×g	0,06×g	Rural District Loc Binh	0,23×g	0,08×g
Rural District Bac Son	0,15×g	0,06×g	Rural District Trang Dinh	0,23×g	0,09×g
Rural District Cao Loc	0,17×g	0,06×g	Rural District Van Long	0,18×g	0,09×g
Rural District Chi Lang	0,15×g	0,06×g	Rural District Van District	0,15×g	0,06×g
Rural District Dinh Lap	0,17×g	0,06×g
37. Lao Cai
City Lao Cai	0,53×g	0,22×g	Rural District Bot Xot	0,39×g	0,17×g
Town Sa Pa	0,25×g	0,12×g	Rural District Muong Khuong	0,14×g	0,06×g
Rural District Bac Ha	0,21×g	0,09×g	Rural District Si Ma Cai	0,13×g	0,06×g
Rural District Bao Yen	0,53×g	0,22×g	Rural District Van Ban	0,36×g	0,14×g
Rural District Bao Thang	0,53×g	0,21×g
38. Lam Dong
City Da Lat	0,08×g	0,03×g	Rural District Don Duong	0,15×g	0,06×g
City Bao Loc	0,08×g	0,03×g	Rural District Duc Trong	0,15×g	0,06×g
Rural District Bao Lom	0,08×g	0,03×g	Rural District Da Huoai	0,08×g	0,03×g
Rural District Cot Tien	0,15×g	0,06×g	Rural District Da Teh	0,08×g	0,03×g
Rural District Di Linh	0,08×g	0,03×g	Rural District Lom Ha	0,07×g	0,03×g
Rural District Dam Rong	0,08×g	0,03×g	Rural District Lac Duong	0,08×g	0,03×g
39. Long An
City Ton An	0,08×g	0,03×g	Rural District Moc Hoa	0,08×g	0,03×g
Town Kien Tuong	0,08×g	0,03×g	Rural District Tan Hung	0,08×g	0,03×g
Rural District Ben Luc	0,13×g	0,06×g	Rural District Ton Thanh	0,08×g	0,03×g
Rural District Can Duoc	0,15×g	0,06×g	Rural District Ton Tru	0,15×g	0,06×g

Rural District Can Giuoc	0,13×g	0,06×g	Rural District Thanh Hoa	0,08×g	0,03×g
Rural District Chau Thanh	0,08×g	0,03×g	Rural District Thu THoa	0,15×g	0,06×g
Rural District Duc Hoa	0,13×g	0,06×g	Rural District Vinh Hung	0,08×g	0,03×g
Rural District Duc Hue	0,13×g	0,06×g
40. Nam Dinh
City Nam Dinh	0,53×g	0,22×g	Rural District Nghia Hung	0,53×g	0,21×g
Rural District Giao Thuy	0,39×g	0,18×g	Rural District Truc Ninh	0,53×g	0,22×g
Rural District Hai Hau	0,53×g	0,21×g	Rural District Vu Ban	0,53×g	0,21×g
Rural District My Loc	0,53×g	0,22×g	Rural District Xuan Truong	0,53×g	0,22×g
Rural District Nam Truc	0,53×g	0,22×g	Rural District i Yen	0,39×g	0,19×g
41. Nghe An
City Vinh	0,38	0,17×g	Rural District Nam Dan	0,38×g	0,17×g
Town Cua Lu	0,38×g	0,18×g	Rural District Nghia Dan	0,38×g	0,15×g
Town Hoàng Mai	0,33×g	0,15×g	Rural District Que Phong	0,30×g	0,12×g
Town Thai Hoa	0,38×g	0,16×g	Rural District Quy Hop	0,26×g	0,12×g
Rural District Anh Son	0,37×g	0,14×g	Rural District Quynh Luu	0,38×g	0,14×g
Rural District Con Cuung	0,36×g	0,16×g	Rural District Quy Chau	0,30×g	0,11×g
Rural District Dien Chau	0,35×g	0,14×g	Rural District Ton Ky	0,36×g	0,15×g
Rural District Do Luong	0,38×g	0,18×g	Rural District Thanh Chuong	0,38×g	0,19×g
Rural District Hung Nguyen	0,38×g	0,19×g	Rural District Tuong Duong	0,30×g	0,12×g
Rural District Ky Son	0,25×g	0,09×g	Rural District Yen THanh	0,36×g	0,14×g
Rural District Nghi Loc	0,38×g	0,18×g
42. Ninh Binh
City Ninh Binh	0,37×g	0,18×g	Rural District Kim Son	0,36×g	0,19×g
Town Tam Diep	0,45×g	0,18×g	Rural District Nho District	0,45×g	0,18×g
Rural District Gia Vien	0,25×g	0,11×g	Rural District Yen Khonh	0,38×g	0,18×g
Rural District Hoa Lu	0,36×g	0,15×g	Rural District Yen Mu	0,45×g	0,18×g
43. Ninh Thoan
City Phan Rang- Thop CHam	0,08×g	0,03×g	Rural District Ninh Son	0,08×g	0,03×g
Rural District Boc oi	0,08×g	0,03×g	Rural District Thoan Bac	0,08×g	0,03×g
Rural District Ninh Hai	0,08×g	0,03×g	Rural District Thoan Nam	0,08×g	0,03×g
Rural District Ninh Phuoc	0,08×g	0,03×g
44. Phu Tho
City Viet Tro	0,53×g	0,20×g	Rural District Tam Nung	0,38×g	0,19×g
Town Phu Tho	0,53×g	0,21×g	Rural District Tan Son	0,30×g	0,12×g
Rural District Cam Kho	0,39×g	0,17×g	Rural District Thanh Ba	0,53×g	0,22×g
Rural District Doan Hung	0,39×g	0,19×g	Rural District Thanh Son	0,26×g	0,12×g
Rural District Ha Hoa	0,39×g	0,19×g	Rural District Thanh Thuy	0,29×g	0,13×g
Rural District Lom Thao	0,53×g	0,21×g	Rural District Yen Lap	0,28×g	0,12×g
Rural District Phu Ninh	0,53×g	0,22×g
45. Phu Yen
City Tuy Hoa	0,15×g	0,06×g	Rural District Sung Hinh	0,08×g	0,03×g
Town Sung Cau	0,18×g	0,09×g	Rural District Son Hoa	0,15×g	0,06×g
Rural District Dong Hoa	0,15×g	0,06×g	Rural District Tay Hoa	0,15×g	0,06×g
Rural District Dong Xuan	0,20×g	0,09×g	Rural District Tuy An	0,18×g	0,09×g
Rural District Phu Hoa	0,13×g	0,06×g
46. Quang Binh
City Dong Hoi	0,14×g	0,06×g	Rural District Minh Hoa	0,23×g	0,09×g
Town Ba Don	0,30×g	0,12×g	Rural District Quang Ninh	0,15×g	0,06×g
Rural District Bo Trach	0,23×g	0,09×g	Rural District Quang Trach	0,25×g	0,11×g
Rural District Le Thuy	0,15×g	0,06×g	Rural District Tuyen Hoa	0,30×g	0,12×g
47. Quang Nam
City Tam Ky	0,14×g	0,06×g	Rural District Nam Giang	0,08×g	0,03×g
City Hoi An	0,15×g	0,06×g	Rural District Nong Son	0,15×g	0,06×g
Town Dien Ban	0,15×g	0,06×g	Rural District Nyi THanh	0,08×g	0,03×g
Rural District Bac Tra My	0,30×g	0,12×g	Rural District Phu Ninh	0,13×g	0,06×g
Rural District Duy XuYen	0,15×g	0,06×g	Rural District Phuoc Son	0,23×g	0,09×g
Rural District Dai Loc	0,15×g	0,06×g	Rural District Que Son	0,23×g	0,08×g
Rural District Dong Giang	0,15×g	0,06×g	Rural District Tay Giang	0,15×g	0,06×g
Rural District Hiep Duc	0,45×g	0,17×g	Rural District Thang Binh	0,14×g	0,06×g
Rural District Nam Tra My	0,30×g	0,12×g	Rural District Tien Phuoc	0,15×g	0,06×g
48. Quang Ngai
City Quang Ngai	0,13×g	0,06×g	Rural District Nghia Hanh	0,15×g	0,06×g
Rural District Ba To	0,16×g	0,06×g	Rural District Son Ha	0,15×g	0,06×g
Rural District Binh Son	0,14×g	0,06×g	Rural District Son Tay	0,08×g	0,03×g
Rural District Duc Pho	0,18×g	0,06×g	Rural District Son Tinh	0,23×g	0,09×g
Rural District Ly Son	0,07×g	0,03×g	Rural District Tay Tra	0,13×g	0,06×g
Rural District Minh Long	0,08×g	0,03×g	Rural District Tra Bong	0,13×g	0,06×g
Rural District Mo Duc	0,15×g	0,06×g	Rural District Tu Nghia	0,15×g	0,06×g
49. Quang Ninh
City Ha Long	0,38×g	0,15×g	City Mung Coi	0,23×g	0,09×g
City Cam Pha	0,30×g	0,13×g	City Uung Bo	0,45×g	0,18×g
Town Quang Yen	0,45×g	0,19×g	Rural District Dong Trieu	0,45×g	0,19×g
Rural District Ba Che	0,38×g	0,15×g	Rural District Hai Ha	0,15×g	0,06×g
Rural District Binh Lieu	0,15×g	0,06×g	Rural District Tien Yen	0,20×g	0,09×g
Rural District Cu Tu	0,08×g	0,03×g	Rural District Van Don	0,23×g	0,09×g
Rural District Dam Ha	0,13×g	0,06×g
50. Quang Tri
City Dong Ha	0,15×g	0,06×g	Rural District Gio Linh	0,15×g	0,06×g
Town Quang Tri	0,15×g	0,06×g	Rural District Huong Hoa	0,15×g	0,06×g
Rural District Cam Lo	0,15×g	0,06×g	Rural District Hai Lang	0,15×g	0,06×g
Rural District Con Co	0,25×g	0,09×g	Rural District Trieu Phong	0,15×g	0,06×g
Rural District Da Krong	0,15×g	0,06×g	Rural District Vinh Linh	0,15×g	0,06×g
51. Soc Trang
City Soc Trang	0,08×g	0,03×g	Rural District Long Phu	0,15×g	0,06×g
Town Vinh Chau	0,06×g	0,03×g	Rural District My Ty	0,08×g	0,03×g
Town Ngo Nam	0,08×g	0,03×g	Rural District My XuYen	0,08×g	0,03×g
Rural District Chau Thanh	0,08×g	0,03×g	Rural District Thanh Tri	0,08×g	0,03×g
Rural District Cu Lao Dung	0,15×g	0,06×g	Rural District Tran De	0,08×g	0,03×g
Rural District Ke Soch	0,15×g	0,06×g
52. Son La
City Son La	0,68×g	0,26×g	Rural District Quynh Nhai	0,45×g	0,19×g
Rural District Bac Yen	0,26×g	0,12×g	Rural District Sung Mo	0,53×g	0,20×g
Rural District Mai Son	0,68×g	0,25×g	Rural District Sop Cop	0,40×g	0,18×g
Rural District Moc Chau	0,83×g	0,35×g	Rural District Thoan Chau	0,83×g	0,32×g
Rural District Muong La	0,38×g	0,16×g	Rural District Von Ho	0,75×g	0,31×g
Rural District Phu Yen	0,25×g	0,13×g	Rural District Yen Chau	0,75×g	0,28×g
53. Tay Ninh
City Tay Ninh	0,15×g	0,06×g	Rural District Hoa THanh	0,15×g	0,06×g
Rural District Ben Cau	0,23×g	0,08×g	Rural District Ton Bien	0,13×g	0,06×g
Rural District Chau Thanh	0,13×g	0,06×g	Rural District Ton Chau	0,13×g	0,06×g
Rural District Duong Minh Chau	0,15×g	0,06×g	Rural District Trang Bang	0,12×g	0,06×g
Rural District Gu Dau	0,15×g	0,06×g
54. Thai Binh
City Thai Binh	0,38×g	0,17×g	Rural District Quynh Phu	0,21×g	0,08×g
Rural District Dong Hung	0,27×g	0,12×g	Rural District Thai Thuy	0,23×g	0,09×g
Rural District Hung Ha	0,37×g	0,19×g	Rural District Tien Hai	0,25×g	0,13×g
Rural District Kien Xuong	0,36×g	0,14×g	Rural District Vu Thu	0,39×g	0,17×g
55. Thai NguYen
City Thai NguYen	0,30×g	0,11×g	Rural District Dong Hy	0,38×g	0,14×g
City Pho Yen	0,26×g	0,13×g	Rural District Phu Binh	0,23×g	0,09×g
Town Sung Cung	0,26×g	0,12×g	Rural District Phu Luong	0,38×g	0,15×g
Rural District Dai Tu	0,45×g	0,18×g	Rural District Vu Nhai	0,15×g	0,06×g
Rural District Dinh Hoa	0,14×g	0,06×g
56. Thanh Hoa
City Thanh Hoa	0,53×g	0,20×g	Rural District Hau Loc	0,75×g	0,30×g
City Sam Son	0,37×g	0,17×g	Rural District Hoang Hoa	0,75×g	0,32×g
Town Bim Son	0,68×g	0,28×g	Rural District Lang Chong	0,37×g	0,18×g
Town Nghi Son	0,38×g	0,19×g	Rural District Muong Lat	0,53×g	0,22×g
Rural District Ba Thuoc	0,68×g	0,25×g	Rural District Nga Son	0,60×g	0,25×g
Rural District Cam Thuy	0,75×g	0,30×g	Rural District Ngoc Lac	0,37×g	0,18×g
Rural District Dong Son	0,39×g	0,18×g	Rural District Nhu Thanh	0,39×g	0,19×g
Rural District Ha Trung	0,83×g	0,33×g	Rural District Nhu Xuan	0,36×g	0,16×g
Rural District Nung Cong	0,39×g	0,18×g	Rural District Trieu Son	0,38×g	0,18×g
Rural District District Hoa	0,43×g	0,22×g	Rural District Thuong Xuan	0,38×g	0,19×g
Rural District District Son	0,35×g	0,16×g	Rural District Tho Xuon	0,37×g	0,17×g
Rural District Quang Xuong	0,37×g	0,19×g	Rural District Vinh Loc	0,83×g	0,32×g
Rural District Thach THanh	0,75×g	0,30×g	Rural District Yen Dinh	0,68×g	0,27×g
Rural District Thieu Hoa	0,53×g	0,22×g
57. Thua Thien Hue
City Hue	0,23×g	0,09×g	Rural District Phong Dien	0,23×g	0,10×g
Town Huong Thuy	0,30×g	0,12×g	Rural District Phu Loc	0,15×g	0,06×g
Town Huong Tra	0,23×g	0,09×g	Rural District Phu Vang	0,30×g	0,12×g
Rural District A Luoi	0,15×g	0,06×g	Rural District Quang Dien	0,23×g	0,09×g
Rural District Nam Dong	0,30×g	0,12×g
58. Tien Giang
City My Tho	0,08×g	0,03×g	Rural District Cho Gao	0,08×g	0,03×g
Town Cai Lay	0,08×g	0,03×g	Rural District Gu Cung Tay	0,15×g	0,06×g
Town Gu Cung	0,13×g	0,06×g	Rural District Gu Cung Dong	0,15×g	0,06×g
Rural District Coi Bo	0,08×g	0,03×g	Rural District Tan Phuoc	0,08×g	0,03×g
Rural District Cai Lay	0,08×g	0,03×g	Rural District Tan Phu Dong	0,15×g	0,06×g
Rural District Chau Thanh	0,08×g	0,03×g
59. Tra Vinh
City Tra Vinh	0,08×g	0,03×g	Rural District Cau Ngang	0,08×g	0,03×g
Town, Rural District DuYen Hai	0,15×g	0,06×g	Rural District Chau Thanh	0,08×g	0,03×g
Rural District Càng Long	0,08×g	0,03×g	Rural District Tra Cy	0,13×g	0,06×g
Rural District Cau Ko	0,15×g	0,06×g	Rural District Tieu Can	0,15×g	0,06×g
60. Tuyen Quang
City Tuyen Quang	0,19×g	0,09×g	Rural District Na Hang	0,14×g	0,06×g
Rural District Chiem Hoa	0,15×g	0,06×g	Rural District Son Duong	0,23×g	0,09×g
Rural District Ham Yen	0,23×g	0,08×g	Rural District Yen Son	0,27×g	0,12×g
Rural District Lom Binh	0,12×g	0,06×g
61. Vinh Long
City Vinh Long	0,08×g	0,03×g	Rural District Tam Binh	0,15×g	0,06×g
Town Binh Minh	0,13×g	0,06×g	Rural District Tra en	0,13×g	0,06×g
Rural District Long Ho	0,08×g	0,03×g	Rural District Vung Liem	0,08×g	0,03×g
Rural District Mang Thot	0,08×g	0,03×g	Rural District Binh Ton	0,15×g	0,06×g
62. Vinh Phuc
City Vinh Yen	0,30×g	0,15×g	Rural District Tam Duong	0,29×g	0,13×g
City Phuc Yen	0,25×g	0,12×g	Rural District Tam Dao	0,30×g	0,13×g
Rural District Binh XuYen	0,27×g	0,12×g	Rural District Vinh Tuong	0,53×g	0,21×g
Rural District Lap Thach	0,36×g	0,16×g	Rural District Yen Lac	0,38×g	0,17×g
Rural District Sung Lu	0,38×g	0,19×g
63. Yen Bai
City Yen Bai	0,53×g	0,20×g	Rural District Tran Yen	0,53×g	0,20×g
Town Nghia Lo	0,29×g	0,13×g	Rural District Van Chan	0,30×g	0,12×g
Rural District Luc Yen	0,37×g	0,16×g	Rural District Van Yen	0,53×g	0,22×g
Rural District Mu Cang Chai	0,27×g	0,11×g	Rural District Yen Binh	0,53×g	0,20×g
Rural District Tram Tau	0,30×g	0,13×g

Table 6.3 – Classification of structural damage ¹⁾

I. Type of structure
(Buildings constructed without earthquake-resistant measures)
Type A: Buildings with low rigidity masonry walls, rural architecture; buildings with walls made of slate, clay.
Type B: Ordinary brick buildings, large block and precast buildings, half-timber architecture, buildings made of dressed hard stone.
Type C: Reinforced concrete buildings, good quality wooden buildings.

II. Quantitative characteristics
Few: about 5%, many: about 50%, most: about 75%.

III. Damage grades
Grade 1 – Slight damage: cracking of plaster and falling of small plaster fragments.
Grade 2 – Moderate damage: small cracks in walls, falling of fairly large plaster pieces, tiles falling, cracks in chimneys, parts of chimneys falling.
Grade 3 – Heavy damage: large and deep cracks in walls, falling of chimneys.
Grade 4 – Destruction: cracks passing through walls, collapse of parts of buildings, damage to connections between separate parts of buildings, collapse of interior and frame walls.
Grade 5 – Collapse: complete destruction of buildings.

1) Source: Appendix VIII, A., Decision No. 18/2021/QD-TTg of the Prime Minister dated April 22, 2021.

Table 6.4 – Classification of earthquake effects according to the MSK – 64 scale and conversion between reference peak ground acceleration and surface shaking intensity ¹⁾

Surface shaking intensity (or earthquake grade), I	Reference peak ground acceleration, a_gR	Description of characteristics
V	0,012g – 0,03g	Awaken Felt indoors by all, outdoors by many. Many sleeping people awake. A few run outdoors. Animals become uneasy. Buildings tremble throughout. Hanging objects swing considerably. Pictures knock against walls or swing out of place. In a few cases, pendulum clocks stop. A few unstable objects may be overturned or shifted. Open doors and windows are thrust open and slam back again. Liquids spill in small amounts from well-filled open containers. The sensation is like that of a heavy object falling inside the building.
VI	0,03g – 0,06g	Frightened Felt by most indoors and outdoors. Many people in buildings are frightened and run outdoors. A few persons lose their balance. Domestic animals run out of their stalls. In a few instances, dishes and glassware may break, books fall down. Heavy furniture may possibly move and small steeple bells may ring. Damage of Grade 1 is sustained in a few buildings of Type B and in many of Type A; a few buildings of Type A sustain damage of Grade 2. On wet ground, cracks up to widths of 1 cm may occur; landslides are possible on steeper slopes. Changes in flow or temperature of springs and wells may occur.
VII	0,06g – 0,12g	Damage to buildings Most people are frightened and run outdoors. Many find it difficult to stand. The vibration is noticed by persons driving motor cars. Large bells ring. Damage of Grade 1 is caused to many buildings of Type C; many buildings of Type B suffer damage of Grade 2; most buildings of Type A suffer damage of Grade 3, a few of Grade 4. In a few cases, landslides of roadcuts on steep slopes and cracks in paved roads are observed. Ruptures, cracks and shifting of pipework connections occur. Stone walls collapse. Some house water tanks become dislodged. Water in lakes becomes turbid due to mud stirred up. Changes in flow and level of water in wells may occur. In a few instances, new springs appear or existing springs disappear.
VIII	0,12g – 0,24g	Destruction of buildings Panic and fear is general, even persons driving motor cars are disturbed. Here and there branches of trees break off. Furniture is partly overturned. Objects fall from shelves. Tombstones may occasionally shift, twist or overturn. Stone walls collapse. Many buildings of Type C suffer damage of Grade 2, a few of Grade 3; many buildings of Type B suffer damage of Grade 3, a few of Grade 4; many buildings of Type A suffer damage of Grade 4, a few of Grade 5. Ruptures, cracks and shifts of pipework connections are frequent. Monuments and statues move and twist. Tombstones overturn. Stone walls collapse. Landslides considerable on riverbanks and steep slopes; cracks develop in ground up to widths of several centimeters. New water basins form. Dry wells refill or existing wells become dry. In many cases, change in flow and level of water is observed.
IX	0,24g – 0,48g	Complete damage to buildings General panic. Considerable damage to furniture. Animals run wildly and cry. Many buildings of Type C suffer damage of Grade 3, a few of Grade 4; many buildings of Type B show damage of Grade 4, a few of Grade 5. Most buildings of Type A suffer damage of Grade 5. Monuments and columns fall. Considerable damage to reservoirs; underground pipes partly broken. Railroad tracks are bent and roadway damaged. On flat land, flooding occurs and sand and mud are ejected. Ground cracks to widths of up to 10 cm develop; on slopes and riverbanks, more than 10 cm. Landslides widespread in steep terrain; rock falls occur. Large waves appear on water.
X	0,48g – 0,8g	Complete destruction of buildings Many buildings of Type C suffer damage of Grade 4, a few of Grade 5; many buildings of Type B show damage of Grade 5; most buildings of Type A have destruction of Grade 5. Critical damage to dams and dykes and severe damage to bridges. Railway lines are slightly bent and pipework is put out of service. Pavements and asphalt show waves. Ground considerably distorted by broad cracks and fissures, as well as by movement in horizontal and vertical directions; in some cases, up to 1 m. Parallelism of rivers banks is destroyed, river beds change. Water from canals, lakes, rivers is thrown on land. New lakes occur.
1) Source: Appendix VIII, B., Decision No. 18/2021/QD-TTg of the Prime Minister dated April 22, 2021.
NOTE: In Table 6.4, the value a_gR is the reference peak ground acceleration determined for soil type A (rock, hard rock), with a 500-year return period; when converting, the surface shaking intensity in Table 6.4 is also the earthquake grade according to the MSK -64 scale corresponding to soil type A, with a 500-year return period; g = 9.81 m/s² (gravitational acceleration).

7 IMPLEMENTATION ORGANIZATION

7.1 Transitional provisions

a) Construction investment projects approved before the effective date of QCVN 02:2022/BXD shall have subsequent implementation steps carried out in accordance with the provisions of QCVN 02:2009/BXD.

b) Construction investment projects approved after the effective date of QCVN 02:2022/BXD shall be implemented in accordance with the provisions of QCVN 02:2022/BXD.

7.2 During the implementation of this regulation, if any difficulties or problems arise, all comments should be sent to the Department of Science, Technology and Environment – Ministry of Construction for guidance and resolution.

7.3 The Ministry of Construction is responsible for organizing the dissemination and guidance on the application of this regulation to relevant subjects.

7.4 The local state management agencies on construction are responsible for organizing the inspection of compliance with this regulation in the design and construction of works and other construction activities in their localities in accordance with the provisions of law.