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Crustal structure in central California in relation to the Sierra Nevada

SEISMOGRAPHIC STATION UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA

Abstract

Crustal structure in central California (between the latitudes of 36° and 41°N) including the Sierra Nevada was studied by travel times of P_n waves from Nevada explosions and earthquakes, dispersion of surface waves, and correlation between computed and observed gravity anomalies.

Simple two-dimensional models are presented for the structure, parameters of which are determined by least-squares from P_n observations. Theoretical gravity distributions expected from the crustal models are computed by a two-dimensional technique and compared with Bouguer anomalies. In the preferred model, the overall crustal depths to the Moho-discontinuity beneath the Pacific coast region, the Central Valley and the Sierra Nevada are found to be about 22, 26 and 43 km, respectively, indicating a steep crustal thickening under the high mountain region. The dispersion of group velocities of Rayleigh and Love waves passing across the region was investigated from Nevada and Utah earthquakes; Love waves from the Utah earthquake give evidence in support of the derived structure.

Footnotes

on leave from DISASTER PREVENTION RESEARCH INSTITUTE, KYOTO UNIVERSITY, KYOTO, JAPAN

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