Variation of P-wave velocity before the Bear Valley, California, earthquake of 24 February 1972
Science
By: R. Robinson, R. L. Wesson, and W.L. Ellsworth
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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.
Suggested Citation
Robinson, R., Wesson, R.L., and Ellsworth, W., 1974, Variation of P-wave velocity before the Bear Valley, California, earthquake of 24 February 1972: Science, v. 184, no. 4143, p. 1281-1283, https://doi.org/10.1126/science.184.4143.1281.
Study Area
| 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 |
| DOI | 10.1126/science.184.4143.1281 |
| Volume | 184 |
| Issue | 4143 |
| Year Published | 1974 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Description | 3 p. |
| First page | 1281 |
| Last page | 1283 |
| Country | United States |
| State | California |
| Other Geospatial | Bear Valley |