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P-wave image of the crust and uppermost mantle in southern California

Zhao, Dapeng and Kanamori, Hiroo (1992) P-wave image of the crust and uppermost mantle in southern California. Geophysical Research Letters, 19 (23). pp. 2329-2332. ISSN 0094-8276. doi:10.1029/92GL02719.

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We have determined a P-wave tomographic image of the crust and uppermost mantle in southern California by using 131,372 P-wave arrival times from 6,437 local earthquakes recorded by the Caltech-USGS Southern California Seismic Network in the past twelve years. The obtained image has a spatial resolution of 25 km in the horizontal direction and 8–11 km in depth. The tomographic image is found to correlate well with major surface geological features. In the shallow crust, sedimentary basins such as the Los Angeles Basin, Ventura Basin and Santa Maria Basin are well imaged as low velocities, while batholiths such as the Peninsular Ranges and San Gabriel Mountains are imaged as high velocities. In the deeper crust, the velocity is low beneath the Mojave Desert, Coso volcanic area and Salton Trough, while it is high beneath the Great Valley, Continental Borderland and the major basins. A high-velocity layer exists in the mid-crust beneath the Salton Trough, in good agreement with a previous study using seismic explosions and gravity data. In the uppermost mantle, the velocity is low beneath southeastern Sierra Nevada and the volcanic areas while it is high beneath the Mojave Desert and along the Pacific coast.

Item Type:Article
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URLURL TypeDescription DOIArticle
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1992 by the American Geophysical Union. Paper number 92GL02719. Received September 10, 1992; accepted October 20, 1992. We appreciate the helpful discussions with K. Aki, D.L. Anderson, R.W. Clayton, T. Heaton, L.T. Silver and W. Huang., E. Humphreys, D. Wald and an anonymous referee critically read the manuscript and provided helpful comments, which improved the manuscript. The first author (DZ) was supported by the Southern California Earthquake Center (SCEC) and this is SCEC Publication No. 10. This work was partially supported by a National Science Foundation grant, EAR-92-04748. Contribution No. 5206, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena., CA 91125.
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Southern California Earthquake Center (SCEC)UNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences5206
Southern California Earthquake Center (SCEC)10
Issue or Number:23
Record Number:CaltechAUTHORS:20141105-111617515
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51295
Deposited By: Tony Diaz
Deposited On:05 Nov 2014 20:14
Last Modified:10 Nov 2021 19:08

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