The Richter scale , also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, is a measure of the strength of earthquakes, developed by See more

Prior to the development of the magnitude scale, the only measure of an earthquake's strength or "size" was a subjective assessment of the intensity of shaking observed near the epicenter of … 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
• Perspective: a graphical comparison of earthquake energy release – Pacific Tsunami Warning Center See more