A possible geodetic anomaly observed prior to the Loma Prieta, California, Earthquake
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Abstract
Monthly measurements since mid‐1981 of distance from a geodetic station located 11 km from the epicenter of the Loma Prieta earthquake (Ms = 7.1; October 17, 1989) to three stations 30 to 40 km distant provides an unusually complete record of deformation in the epicentral region in the years prior to an earthquake. Roughly 1.3 years before the earthquake, at about the time of the first magnitude‐5 foreshock, the rate of change in line length for two of the lines appears to change; the rate for the third line does not change. Other similar, though smaller, changes in rate are apparent in the eight‐year record. Thus, there is marginal evidence for a change in deformation rate about one year before the Loma Prieta earthquake, but that change need not be a precursor.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A possible geodetic anomaly observed prior to the Loma Prieta, California, Earthquake |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/GL017i008p01211 |
| Volume | 17 |
| Issue | 8 |
| Year Published | 1990 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Earthquake Science Center |
| Description | 4 p. |
| First page | 1211 |
| Last page | 1214 |
| Country | United States |
| State | California |
| Other Geospatial | Loma Prieta |
| Google Analytic Metrics | Metrics page |