B-value
B-value :
A coefficient in the frequency-magnitude relation, log N(M) = a bM, obtained by Gutenberg and Richter (1941; 1949), where M is the earthquake magnitude and N(M) is the number of earthquakes with magnitude greater than or equal to M. Estimated b-values for most seismic zones fall between 0.6 and 1.1, but may be higher in volcanic regions, earthquake swarms and aftershock sequences. See also the biographies of Beno Gutenberg and Charles Francis Richter in Howell (2003)
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