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Bulletin of the Seismological Society of America; April 1973; v. 63; no. 2; p. 713-729
© 1973 Seismological Society of America
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Travel-time anomalies and distribution of earthquakes along the Calaveras Fault zone, California*

DIETER MAYER-ROSA{dagger}

NATIONAL CENTER FOR EARTHQUAKE RESEARCH U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025

Abstract

The U.S. Geological Survey's telemetered seismic network in central California was supplemented over a 7-week period with 13 portable seismograph stations in the area of the Calaveras Fault southeast of San Jose. Travel-time data from small quarry explosions indicate a vertical low-velocity zone apparently associated with the fault and extending to a depth of at least 6 km.

When this zone is taken into account, the hypocenters of 55 earthquakes recorded to study this effect show an arrangement of a near-vertical dipping plane that coincides remarkably well with the mapped trace of the fault. The previously determined distribution of foci was off the fault by several kilometers to the east.

Footnotes

* Publication authorized by the Director, U.S. Geological Survey.

{dagger} Present address: The Institute for Geophysics, E.T.H. Zürich, Switzerland.




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