Postseismic Deformation and Stress Evolution Following the 1906 San Francisco Earthquake
Abstract
Large earthquakes, like the M 7.8 1906 San Francisco earthquake, can have both short- and long-term effects on the strain field. Numerical simulation using finite element models is a key method to study time-dependent tectonic deformation mechanisms. Geodetic data are essential for testing model results for accuracy and realism. Previous GeoFEST (Geophysical Finite Element Simulation Tool) viscoelastic finite element model results indicate about 2-5 mm/yr of residual velocities in the 100 years following the 1906 San Francisco earthquake. These models combined simple, single fault viscoelastic finite element models featuring variable relaxation times in the lower crust with various elastic backslip models in order to create velocity profiles to compare with currently observed geodetic rates. This study will include new results from more sophisticated 3D GeoFEST models that incorporate multiple faults and imposed plate velocity boundary conditions and compare these results with GPS velocities recorded by the Bay Area Regional Deformation (BARD) network. In addition, the study will include results examining the evolution of the Coulomb stress changes in the viscoelastic model over the 100 years following the San Francisco earthquake.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- Bibcode:
- 2007AGUFM.G13A0910G
- Keywords:
-
- 1240 Satellite geodesy: results (6929;
- 7215;
- 7230;
- 7240);
- 1242 Seismic cycle related deformations (6924;
- 7209;
- 7223;
- 7230);
- 6924 Interferometry (1207;
- 1209;
- 1242);
- 7223 Earthquake interaction;
- forecasting;
- and prediction (1217;
- 1242);
- 7230 Seismicity and tectonics (1207;
- 1217;
- 1240;
- 1242)