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Abstract
Results from the San Francisco Bay area seismic imaging experiment (BASIX) reveal the presence of a prominent lower crustal reflector at a depth of ~ 15 kilometers beneath San Francisco and San Pablo bays. Velocity analyses indicate that this reflector marks the base of Franciscan assemblage rocks and the top of a mafic lower crust. Because this compositional contrast would imply a strong rheological contrast, this interface may correspond to a lower crustal detachment surface. If so, it may represent a subhorizontal segment of the North America and Pacific plate boundary proposed by earlier thermomechanical and geological models.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California |
| Series title | Science |
| Volume | 265 |
| Issue | 5177 |
| Year Published | 1994 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 1436 |
| Last page | 1439 |
| Google Analytic Metrics | Metrics page |