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Variation of P-wave velocity before the Bear Valley, California, earthquake of 24 February 1972

Science

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Abstract

Residuals for P-wave traveltimes at a seismograph station near Bear Valley, California, for small, precisely located local earthquakes at distances of 20 to 70 kilometers show a sharp increase of nearly 0.3 second about 2 months before a magnitude 5.0 earthquake that occurred within a few kilometers of the station. This indicates that velocity changes observed elsewhere premonitory to earthquakes, possibly related to dilatancy, occur along the central section of the San Andreas fault system.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Variation of P-wave velocity before the Bear Valley, California, earthquake of 24 February 1972
Series title:
Science
Volume
184
Issue:
4143
Year Published:
1974
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1281
Last page:
1283