Precise tremor source locations and amplitude variations along the lower-crustal central San Andreas Fault

Details Precise tremor source locations and amplitude variations along the lower-crustal central San Andreas Fault Precise tremor source locations and amplitude variations along the lower-crustal central San Andreas Fault

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3714301s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 14, CiteID L14301

Physics

9

Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Transform Faults, Tectonophysics: Dynamics And Mechanics Of Faulting (8004), Tectonophysics: Dynamics: Seismotectonics, Tectonophysics: Rheology: Crust And Lithosphere (8031)

Scientific paper

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.

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