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.