Group A, Poster #255, San Andreas Fault System (SAFS)
Large Events on the Southern San Andreas Fault Modulated by Lake Filling Events
Poster Image:
Poster Presentation
2022 SCEC Annual Meeting, Poster #255, SCEC Contribution #12375 VIEW PDF
nge of material properties of the Earth's crust and well constrained lake ages, the estimated stress perturbations are of the order of 0.5 MPa, likely sufficient for triggering. Stress perturbations are dominated by pore pressure changes, but are enhanced by the poroelastic “memory" effect whereby increases in pore pressure due to previous lake high stands do not completely vanish by diffusion and constructively interfere with the undrained response in subsequent high stands. Our preferred model suggests that the lake loading modulated the interseismic stress accumulation on average by as much as 16-44%. The destabilizing effects of lake inundation are enhanced by a non-vertical fault dip, presence of a fault damage zone, and lateral pore pressure diffusion. Our results are applicable to other regions where hydrologic loading, either natural or anthropogenic, is associated with significant seismicity.
SHOW MORE
SHOW MORE