| Abstract: | The Coalinga earthquake sequence of 1983 provided a unique opportunity to perform a three-dimensional velocity and hypocenter inversion in an area of complex three-dimensional structure dominated by folding and blind thrusts. Inversion of 7696 P and 1511 S first arrivals from earthquakes and 696 P first arrivals from refraction shots produced a three-dimensional velocity model with grid spacing of 1-2 km in the hypocentral area. The overall shape and location of velocity features correspond well to the mapped surface geology. There is a linear high-velocity body (6.1-6.5 km/s), about 25 km long, from 6 to 8 km depth, that may represent a fragment of Coast Range ophiolite. A shallow low-velocity zone (LVZ), which extends for 20 km along the fold axis at about 6 km depth and correlates with LVZs observed in both the refraction and the reflection data, may indicate high pore pressure caused by lateral compressive strain, Deeper LVZs occur within inferred Franciscan material and may represent multiple thrust faults. -from Author |
| Genre: | Article |
| ProdID: | 70015973 |
| Citation Author: | Eberhart-Phillips, D. |
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| Citation Issue: | B10 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geophysical Research |
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| Citation Search Results Text: | Three-dimensional P and S velocity structure in the Coalinga Region, California; 1990; Article; Journal; Journal of Geophysical Research; Eberhart-Phillips, D. |
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| Citation Volume: | 95 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Three-dimensional P and S velocity structure in the Coalinga Region, California; 1990; Article; Journal; Journal of Geophysical Research; Eberhart-Phillips, D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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