Seismic velocities and attenuation from borehole measurements near the Parkfield prediction zone, Central California
Earthquake Spectra
By: James F. Gibbs and Edward F. Roth
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seismic velocities and attenuation from borehole measurements near the Parkfield prediction zone, Central California |
| Series title | Earthquake Spectra |
| DOI | 10.1193/1.1585538 |
| Volume | 5 |
| Issue | 3 |
| Publication Date | August 01, 1989 |
| Year Published | 1989 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Earthquake Spectra |
| First page | 513 |
| Last page | 537 |