Steep-dip seismic imaging of the shallow San Andreas Fault near Parkfield
Science
By: J.A. Hole, R. D. Catchings, K.C. St. Clair, M. J. Rymer, D. A. Okaya, and B.J. Carney
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Abstract
Seismic reflection and refraction images illuminate the San Andreas Fault to a depth of 1 kilometer. The prestack depth-migrated reflection image contains near-vertical reflections aligned with the active fault trace. The fault is vertical in the upper 0.5 kilometer, then dips about 70° to the southwest to at least 1 kilometer subsurface. This dip reconciles the difference between the computed locations of earthquakes and the surface fault trace. The seismic velocity cross section shows strong lateral variations. Relatively low velocity (10 to 30%), high electrical conductivity, and low density indicate a 1-kilometer-wide vertical wedge of porous sediment or fractured rock immediately southwest of the active fault trace.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Steep-dip seismic imaging of the shallow San Andreas Fault near Parkfield |
| Series title | Science |
| DOI | 10.1126/science.1065100 |
| Volume | 294 |
| Issue | 5546 |
| Year Published | 2001 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Contributing office(s) | Earthquake Science Center |
| Description | 3 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 1513 |
| Last page | 1515 |
| Country | United States |
| State | California |
| City | Parkfield |
| Other Geospatial | San Andreas Fault |
| Google Analytic Metrics | Metrics page |