Preliminary velocity and resistivity models of the Loma Prieta Earthquake region

Geophysical Research Letters
By: , and 

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Abstract

A preliminary three-dimensional velocity model of the Loma Prieta epicentral region in the Santa Cruz Mountains of California has been derived using raypaths from aftershocks recorded by the U.S.G.S. seismic network. In addition, a magnetotelluric sounding profile was completed prior to the earthquake and a two-dimensional resistivity model computed. The velocity and resistivity models include a low-resistivity (3–10 ohm-m), low-velocity (3.3–5.8 km/s) wedge of material between the Zayante and San Andreas faults that extends to depths of over 8 km and is interpreted to be largely Tertiary marine sedimentary rocks. A high-resistivity (>1000 ohm-m), high-velocity (6.4–6.7 km/s) zone between the San Andreas and Sargent faults may represent largely mafic intrusive rocks.

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Publication type Article
Publication Subtype Journal Article
Title Preliminary velocity and resistivity models of the Loma Prieta Earthquake region
Series title Geophysical Research Letters
DOI 10.1029/GL017i008p01235
Volume 17
Issue 8
Year Published 1990
Language English
Publisher American Geophysical Union
Contributing office(s) Earthquake Science Center, Geology, Geophysics, and Geochemistry Science Center
Description 4 p.
First page 1235
Last page 1238
Country United States
State California
Other Geospatial Loma Prieta epicentral region
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