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Richter magnitude scale

Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake. It is a base-10 logarithmic scale obtained by calculating the logarithm of the combined horizontal amplitude of the largest displacement from zero on a seismometer output.

Wikipedia and Wikis

Richter magnitude scale - Wikipedia
http://en.wikipedia.org/wiki/Richter_magnitude_sca ...

Other

What is Richter Magnitude?
http://www.ux1.eiu.edu/~cfjps/1300/magnitude.html
USGS: magnitude and intensity comparison
http://earthquake.usgs.gov/learning/topics/mag_vs_ ...
USGS: 2000-2006 Earthquakes worldwide
http://neic.usgs.gov/neis/eqlists/eqstats.html
USGS: 1990-1999 Earthquakes worldwide
http://neic.usgs.gov/neis/eqlists/info_1990s.html
USGS simplified description of the Richter magnitude scale
http://earthquake.usgs.gov/learning/topics/richter ...

Keywords and Synonyms

Richter magnitude scale, Richter scale, Richter magnitude, Ricter Scale, Major earthquake, Great earthquake, Rare Great earthquake, Strong earthquake, Ritcher Scale