Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; June 1978; v. 68; no. 3; p. 691-697
© 1978 Seismological Society of America
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Shear-wave velocity structure near Oroville, California

LINDA C. SEEKINS, DAVID P. HILL and THOMAS C. HANKS

U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

Average upper crustal shear-wave velocities (Formula) near Oroville, California, have been determined from S-wave arrivals on timed, strong-motion accelerograms of eight aftershocks of the Oroville earthquake (August 1, 1975; ML = 5.7) at twelve sites. The value of Formula to depths of 8 to 10 km is approximately 3.3 km/sec along paths to sites located on or near crystalline basement but decreases systematically at sites across the contact with Great Valley sediments. The average S-wave velocity in this sedimentary column, which varies in thickness from 0 to approximately 600 m thickness in the instrumented area, is about 1 km/sec. S waves from two additional shallow aftershocks and an explosion are used to infer a two-layer structure appropriate for the bedrock sites, consisting of a 2-km thick layer with vs = 2.9 km/sec overlying material with vs = 3.65 km/sec. With the use of one or two trigger times as P waves, well-recorded events can be located within 2 to 3 km of the USGS locations with S-wave arrivals taken from the strong-motion accelerograms.




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