Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.178.1663t&link_type=abstract
Geophysical Journal International, Volume 178, Issue 3, pp. 1663-1676.
Astronomy and Astrophysics
Astronomy
1
Seismicity And Tectonics, Rheology And Friction Of Fault Zones, Transform Faults, Dynamics: Seismotectonics, Mechanics, Theory, And Modelling
Scientific paper
We estimated the shear strength of the San Andreas Fault (SAF) at the Mojave segment (MJS) by combining two different approaches, the numerical simulation of tectonic loading based on elastic/viscoelastic dislocation theory and the centroid moment tensor (CMT) data inversion of seismic events using Akaike's Bayesian information criterion. With a 3-D tectonic loading model we numerically computed the stress fields caused by mechanical interaction at SAF for three representative cases with different frictional coefficients (0.6, 0.3 and 0.1), assuming the frictional coefficients of surrounding thrust faults, which play a role of adjuster to keep the tectonic stress at a certain level, to be a standard value (0.6). The computed tectonic stress fields are significantly different from each other in the distance range of 0-50 km from SAF, where the orientation of maximum horizontal compressive principal stress, measured from the strike of MJS, gradually changes from 45° to 90°. The distance range of the stress rotation becomes narrow as the frictional coefficient of SAF decreases. On the other hand, we estimated the pattern of the tectonic stress field from the CMT data inversion of seismic events in southern California. The inverted stress pattern shows obvious stress rotation in the distance range of 0-40 km from SAF. From the comparison of the observed stress rotation curve with the theoretical curves, we concluded the frictional coefficient of SAF at MJS to be 0.3 (a half of the standard value) but the shear strength to be 140 MPa at the intermediate depth (6 km) of the seismogenic zone. This paradoxical conclusion is quite rational, because plate convergence at MJS inevitably produces high fault-normal compressive stress there.
Matsu'Ura Mitsuhiro
Terakawa Toshiko
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