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Regional seismicity of the Sierran foothills in the vicinity of Oroville, California

OFFICE OF EARTHQUAKE STUDIES U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

The USGS operated 16 short-period seismic stations near Oroville, California, in conjunction with our aftershock study of the Oroville earthquake of 1 August 1975 (M_L = 5.7). Between June 1975 and August 1976, 35 earthquakes were recorded outside the aftershock zone with S-P times at Oroville less than 9 sec and magnitudes between 0.5 and 2.5. We have located those between 38°45' and 40°15'N and 120°30' and 122°15'W using the USGS Oroville network, supplemented with other regional stations. Maps are shown relating this regional seismicity to the Oroville aftershock zone, the M = 5.7 Chico event of 1940, and the historical seismicity. Of particular interest are two small but very well located events at a depth of 40 km down-dip from the Oroville aftershock zone.

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