Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic regionn, California ( USA).
Journal of Geophysical Research
By: C. Sanders, P. Ho-Liu, D. Rinn, and Kanamori Hiroo
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Abstract
We use seismograms of local earthquakes to image relative shear wave attenuation structure in the shallow crust beneath the region containing the Coso volcanic-geothermal area of E California. Seismograms of 16 small earthquakes show SV amplitudes which are greatly diminished at some azimuths and takeoff angles, indicating strong lateral variations in S wave attenuation in the area. 3-D images of the relative S wave attenuation structure are obtained from forward modeling and a back projection inversion of the amplitude data. The results indicate regions within a 20 by 30 by 10 km volume of the shallow crust (one shallower than 5 km) that severely attenuate SV waves passing through them. These anomalies lie beneath the Indian Wells Valley, 30 km S of the Coso volcanic field, and are coincident with the epicentral locations of recent earthquake swarms. No anomalous attenuation is seen beneath the Coso volcanic field above about 5 km depth. Geologic relations and the coincidence of anomalously slow P wave velocities suggest that the attenuation anomalies may be related to magmatism along the E Sierra front.-from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Anomalous shear wave attenuation in the shallow crust beneath the Coso volcanic regionn, California ( USA). |
| Series title | Journal of Geophysical Research |
| Volume | 93 |
| Issue | B4 |
| Year Published | 1988 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geophysical Research |
| First page | 3321 |
| Last page | 3338 |
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