Coulomb stress accumulation along the San Andreas Fault system

摘要: [1] Stress accumulation rates along the primary segments of San Andreas Fault system are computed using a three-dimensional (3-D) elastic half-space model with realistic fault geometry. The is developed in Fourier domain by solving for response an due to point vector body force and analytically integrating from locking depth infinite depth. This approach then applied published slip 18 major strands zone. GPS-derived horizontal velocity measurements spanning entire 1700 × 200 km region used solve apparent each segment. simple fits remarkably well (2.43 mm/yr RMS misfit), although some discrepancies occur Eastern California Shear Zone. also predicts vertical uplift subsidence that agreement independent geologic geodetic estimates. In addition, shear normal stresses compute Coulomb stress rate. As result, we find earthquake recurrence intervals be inversely proportional rate, typical coseismic drops 1–10 MPa. 3-D deformation can ultimately extended include both time-dependent forcing viscoelastic response.