Encyclopedia
Magnitude of the earthquake
Magnitude of the earthquake: quantitative characteristic (on the Richter scale) of seismic energy emitted by the focus, proportional to the normalized with respect to epicentral distance decimal logarithm of the amplitude of the largest ground oscillations recorded during the passage of seismic waves
Source: "SAFETY IN EMERGENCY SITUATIONS. MONITORING AND FORECASTING OF HAZARDOUS GEOLOGICAL PHENOMENA AND PROCESSES. GENERAL REQUIREMENTS. GOST R 22.1.06-99"
(approved by the Decree of the Russian State Standard from 24.05.1999 No. 177)