Seismicity of the Southern California region: 1 January 1932 to 31 December 1972

Abstract

The purpose of this volume is to present the basic seismological data obtained by the southern California network of the Seismological Laboratory, California Institute of Technology, from 1 January 1932 to 31 December 1972. It is essentially a summary local bulletin for the entire 41-year period during which the Laboratory has been systematically locating earthquakes in the southern California region, encompassing some 15,340 events. As such, it repeats much information contained in earlier local bulletins that were compiled and issued in a variety of formats from 1934 through 1967, although this material has now been considerably modified and up-dated, and much additional information such as epicenter maps and recurrence curves has been added. The 1967 to 1972 listings, as well as those of 1932 and 1933, are presented herein for the first time. A much more incomplete catalog going back to October of 1926, without specific epicentral coordinates and without magnitudes, is available for reference at the Seismological Laboratory. Prior to that time, the best systematic listing is that by Townley and Allen (1939), based primarily on felt reports.

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