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UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA
U. S. GEOLOGICAL SURVEY, , Hawaii; FORMERLY WITH THEUNIVERSITY OF CALIFORNIA, BERKELEY.
UNIVERSITY OF ALASKA; COLLEGE; FORMERLY WITHL'INSTITUT POUR LA RECHERCHE SCIENTIFIQUE EN AFRIQUE CENTRALE, CONGO
Abstract
To determine a crustal model for the southwest side of the San Andreas fault, six large quarry blasts near Salinas, California, were recorded at 27 seismographic stations in the region around Salinas, and along a line northwest of the quarry toward San Francisco. Data from these explosions are compared with results of explosion-seismic studies carried out by the U.S. Geological Survey on a profile along the coast of California from San Francisco to Camp Roberts. The velocity of Pg, the P wave refracted through the crystalline crust, in the Salinas region is 6.2 km/sec and the velocity of Pn is about 8.0 km/sec. Velocities of the direct P wave in near-sur-face rocks vary from one place to another, and appear to correlate well with gross geologic features. The thickness of the crust in the region southwest of the San Andreas fault from Salinas to San Francisco is about 22 kilometers.
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