Precise tremor source locations and amplitude variations along the lower-crustal central San Andreas Fault
Geophysical Research Letters
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Abstract
We precisely locate 88 tremor families along the central San Andreas Fault using a 3D velocity model and numerous P and S wave arrival times estimated from seismogram stacks of up to 400 events per tremor family. Maximum tremor amplitudes vary along the fault by at least a factor of 7, with by far the strongest sources along a 25 km section of the fault southeast of Parkfield. We also identify many weaker tremor families, which have largely escaped prior detection. Together, these sources extend 150 km along the fault, beneath creeping, transitional, and locked sections of the upper crustal fault. Depths are mostly between 18 and 28 km, in the lower crust. Epicenters are concentrated within 3 km of the surface trace, implying a nearly vertical fault. A prominent gap in detectible activity is located directly beneath the region of maximum slip in the 2004 magnitude 6.0 Parkfield earthquake.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Precise tremor source locations and amplitude variations along the lower-crustal central San Andreas Fault |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2010GL043672 |
| Volume | 37 |
| Issue | 14 |
| Year Published | 2010 |
| Language | English |
| Publisher | AGU |
| Publisher location | Washington, D.C. |
| Contributing office(s) | Earthquake Science Center |
| Description | L14301 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| Country | United States |
| State | California |
| Other Geospatial | San Andreas Fault |
| Google Analytic Metrics | Metrics page |