Teleseismic tomography of the Loma Prieta Earthquake Region, California: Implications for strain partitioning
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Abstract
From teleseismic travel times we derive three-dimensional velocity models of the upper 71 km in the 1989 Loma Prieta earthquake region, central California. Shallow crustal structure is consistent with local-earthquake tomography. Horizontal velocity gradients at all depths suggest that the San Andreas fault was a deep shear locus, at least at one time. A large low-velocity feature near the Moho beneath Loma Prieta probably is caused by a crustal root. Two low-velocity features at about 45–70 km depth are offset right-laterally along the San Andreas by about 45 km. Cooling of this portion of the upper mantle [Furlong et al., 1989] could have frozen in displacements in this region within a few million years after passage of the Mendocino Triple Junction. These results are consistent with Furlong et al.'s model.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Teleseismic tomography of the Loma Prieta Earthquake Region, California: Implications for strain partitioning |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/95GL01601 |
| Volume | 22 |
| Issue | 16 |
| Year Published | 1995 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 4 p. |
| First page | 2203 |
| Last page | 2206 |
| Country | United States |
| State | California |
| Other Geospatial | San Francisco Bay |
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