Constraints from precariously balanced rocks on preferred rupture directions for large earthquakes on the southern San Andreas Fault |
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| Authors: | Kim Olsen James Brune |
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| Institution: | (1) Dept of Geological Sciences, San Diego State University, 5500 Campanile Dr, San Diego, CA 92182, USA;(2) Nevada Seismological Laboratory, University of Reno, Reno, NV 89557, USA |
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| Abstract: | We have compared near-fault ground motions from TeraShake simulations of Mw7.7 earthquake scenarios on the southern San Andreas Fault with precariously balanced rock locations. The TeraShake scenarios
with different directions of rupture generate radically different ground motions to the northwest of the Los Angeles Basin,
primarily because of directivity effects, and thus provide constraints on the ground motion and rupture direction for the
latest (1690) large event on that section of the San Andreas Fault. Due to the large directional near-field ground motions
predicted by the simulations, we expect the precariously balanced rocks to be located primarily in the backward rupture direction
or near the epicenter. Preliminary results favor persistent nucleation at or slightly northwest of the San Gorgonia Pass fault
zone for large earthquakes on the southern San Andreas Fault. |
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| Keywords: | Finite-difference simulation Long-period ground motion Precariously balanced rocks San Andreas Fault Rupture directivity |
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