Preliminary velocity and resistivity models of the Loma Prieta Earthquake region
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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.
Study Area
| 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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