The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included to compensate for the variation in the distance between … See more

Prior to the development of the magnitude scale, the only measure of an earthquake's strength or "size" was a subjective … See more

The Richter scale was defined in 1935 for particular circumstances and instruments; the particular circumstances refer to it being defined for … See more

These formulae for Richter magnitude $${\displaystyle \ M_{\mathsf {L}}\ }$$ are alternatives to using Richter correlation tables based on Richter standard seismic event $${\displaystyle {\big (}\ M_{\mathsf {L}}=0\ ,}$$ $${\displaystyle \ A=0.001\ {\mathsf {mm}}\ ,}$$ See more

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1. ^ Kanamori 1978, p. 411. Hough (2007, pp. 122–126) discusses the name at some length.
2. ^ McPhee, John (1998). Annals of the Former World. Farrar, Straus and Giroux. p. 608.
3. ^ Kanamori 1978, p. 411; Richter 1935. See more

• Seismic Monitor – IRIS Consortium
• USGS Earthquake Magnitude Policy (implemented on January 18, 2002) – USGS See more