| Abstract: | Shear (S)- and compressional (P)- wave velocities were measured to a depth of 195 m in a borehole near the San Andreas fault where a recurrence of a moderate Parkfield earthquake is predicted. S-wave velocities determined from orthogonal directions of the S-wave source show velocity differences of approximately 20 percent. An average shear-wave Q of 4 was determined in relatively unconsolidated sands and gravels of the Paso Robles Formation in the depth interval 57.5-102.5 m. |
| Genre: | Article |
| ProdID: | 70015412 |
| Citation Author: | Gibbs, James, F.; Roth, Edward, F. |
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| Citation End Page: | 537 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earthquake Spectra |
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| Citation Number Of Pages: | 25 |
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| Citation Search Results Text: | Seismic velocities and attenuation from borehole measurements near the Parkfield prediction zone, Central California; 1989; Article; Journal; Earthquake Spectra; Gibbs, James, F.; Roth, Edward, F. |
| Citation Start Page: | 513 |
| Citation Volume: | 5 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Seismic velocities and attenuation from borehole measurements near the Parkfield prediction zone, Central California; 1989; Article; Journal; Earthquake Spectra; Gibbs, James, F.; Roth, Edward, F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1193/1.1585538 |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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