Physics – Geophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3214313r&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 14, CiteID L14313
Physics
Geophysics
22
Mineral Physics: Elasticity And Anelasticity, Nonlinear Geophysics: Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852), Physical Properties Of Rocks: Fracture And Flow, Seismology: Earthquake Ground Motions And Engineering Seismology, Structural Geology: Fractures And Faults
Scientific paper
We use the two target repeating earthquake sequences of SAFOD to identify time varying properties of the shallow crust in the Parkfield area at the surface and in shallow boreholes. At the surface, we find that the 2004 Parkfield earthquake caused direct S wave delays exceeding 7 ms, and S coda delays exceeding 15 ms. We attribute these delays to cracks formed or opened during the strong shaking of the Parkfield earthquake. Observations at depth show that the direct S wave arrival time was much less affected by the Parkfield earthquake. This provides evidence that damage caused by strong shaking (nonlinear strong ground motion), is limited to the very near surface (<100 m).
Beroza Gregory C.
Rubinstein Justin L.
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