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Dislocation model for aseismic fault slip in the transverse ranges of Southern CaliforniaGeodetic data at a plate boundary can reveal the pattern of subsurface displacements that accompany plate motion. These displacements are modelled as the sum of rigid block motion and the elastic effects of frictional interaction between blocks. The frictional interactions are represented by uniform dislocation on each of several rectangular fault patches. The block velocities and fault parameters are then estimated from geodetic data. Bayesian inversion procedure employs prior estimates based on geological and seismological data. The method is applied to the Transverse Ranges, using prior geological and seismological data and geodetic data from the USGS trilateration networks. Geodetic data imply a displacement rate of about 20 mm/yr across the San Andreas Fault, while the geologic estimates exceed 30 mm/yr. The prior model and the final estimates both imply about 10 mm/yr crustal shortening normal to the trend of the San Andreas Fault. Aseismic fault motion is a major contributor to plate motion. The geodetic data can help to identify faults that are suffering rapid stress accumulation; in the Transverse Ranges those faults are the San Andreas and the Santa Susana.
Document ID
19860009340
Document Type
Contractor Report (CR)
Authors
Cheng, A. (California Univ. Los Angeles, CA, United States)
Jackson, D. D. (California Univ. Los Angeles, CA, United States)
Matsuura, M. (Tokyo Univ. Japan)
Date Acquired
September 5, 2013
Publication Date
January 1, 1985
Subject Category
GEOPHYSICS
Report/Patent Number
NASA-CR-176493
NAS 1.26:176493
Funding Number(s)
CONTRACT_GRANT: NAG5-447
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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