Abstract
An effort was made to investigate the magnitude frequency relationship of earthquakes as were reported in the USCGS Preliminary Determination of Epicenters from 1963 to 1968 and Gutenberg and Richter and Duda’s catalog of earthquakes from 1918 to 1963. The study was carried out for different seismic regions and over different time intervals to look for variations. It is necessary to take into account the dependence of the frequency distribution, (especially for low magnitudes), on the detection capabilities of the seismic network which may vary for different regions and over different time intervals. It was found that a second degree curve removes some of the subjectivity in estimating the “b” value. There is still some question whether the regional variations are significant.
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