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Shear wave observations in the region north of the San Francisco Bay

DEPARTMENT OF GEOPHYSICS STANFORD UNIVERSITY, STANFORD, CALIFORNIA 94305

Abstract

We have examined local earthquake shear wave travel times from a four-station, intermediate-period, three-component seismograph array located in the Coast Ranges north of San Francisco Bay. Our preferred interpretation of the data indicates an upper crustal layer with a shear velocity of 3.05 ± 0.10 km/sec over a lower crustal layer having a shear velocity of 3.87 ± 0.15 km/sec. We estimate the thickness of the upper crustal layer to be 13.0 ± 3.0 km. The shear velocity of the lower crustal layer, 3.87 km/sec, is higher than crustal shear velocities reported elsewhere in the Coast Ranges and corresponds to the shear velocity of layer three of the oceanic crust.