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Science 21 June 1974:
Vol. 184. no. 4143, pp. 1281 - 1283
DOI: 10.1126/science.184.4143.1281
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Articles
Variation of P-Wave Velocity before the Bear Valley, California, Earthquake of 24 February 1972
Russell Robinson 1,
Robert L. Wesson 1, and
William L. Ellsworth 1
1 U. S. Geological Survey, National Center for Earthquake Research, Menlo Park, California 94025
Residuals for P-wave traveltimes at a seismnograph 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.
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- Variation of P-wave velocity before and after the Galway Lake earthquake (ML = 5.2) and the Goat Mountain earthquakes (ML = 4.7, 4.7), 1975, in the Mojave desert, California.
- H. KANAMORI and G. FUIS (1976)
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- Temporal and spatial variations of travel-time residuals in central California for Novaya Zemlya events.
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- Seismic velocity structure along a section of the San Andreas fault near Bear Valley, California.
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