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Seismic velocities and attenuation from borehole measurements near the Parkfield prediction zone, Central California

Earthquake Spectra

By:
,
DOI: 10.1193/1.1585538

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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.

Additional Publication Details

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
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
Number of Pages:
25