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Bulletin of the Seismological Society of America; December 1964; v. 54; no. 6A; p. 1871-1873
© 1964 Seismological Society of America
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The statistics of earthquakes in Southern California

L. KNOPOFF

UNIVERSITY OF CALIFORNIA INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS, LOS ANGELES, CALIFORNIA

Abstract

A statistically significant series of earthquakes in Southern California, 1934-1957, variously filtered to avoid aftershocks and events outside a localized area, has been tested for a Poisson distribution. It has been found that, for any of several methods of filtering, the data do not fit a Poisson distribution and hence a causal connection between weak earthquake events is inferred. The conclusion is in accord with that of Aki for large events.




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