HR: 0830h
AN: G31B-0705    [PDF]
TI: Effects of Lateral Heterogeneity on Strain Accumulation Across the Carrizo Plain Segment of the San Andreas Fault
AU: * Schmalzle, G M
EM: gschmalzle@rsmas.miami.edu
AF: University of Miami, RSMAS, 4600 Rickenbacker Causeway Division, MGG, Miami, FL 33138 United States
AU: Malservisi, R
EM: rmalservisi@rsmas.miami.edu
AF: University of Miami, RSMAS, 4600 Rickenbacker Causeway Division, MGG, Miami, FL 33138 United States
AU: Dixon, T
EM: tdixon@rsmas.miami.edu
AF: University of Miami, RSMAS, 4600 Rickenbacker Causeway Division, MGG, Miami, FL 33138 United States
AB: Changes in lithology, elastic properties or rheology on either side of a fault can influence the pattern of surface strain accumulation and release. Large offset strike-slip faults are likely to juxtapose terrain with different mechanical properties. The central section of the San Andreas Fault exemplifies this behavior by juxtaposing different lithologies and elastic properties on opposite sides of the fault. Lisowski et al. (1991) showed that the San Andreas Fault, south of Cholame and north of the big bend, has an asymmetric strain accumulation pattern. This area is appropriate for detailed study because deformation is dominated by a single strike-slip fault, and geophysical and geologic studies provide constraints on elastic thickness, rheology, fault kinematics and earthquake history. A well defined velocity profile is also available (SCEC v.3.0). Using these data, we analyze the effect of laterally varying mechanical properties on interseismic strain accumulation and the earthquake cycle using the finite element model TECTON. Lisowski, M., J.C. Savage, and W.H. Prescott, The velocity field along the San Andreas fault in central and southern California, J. Geophys. Res., 96, 8369-8389, 1991.
DE: 1206 Crustal movements--interplate (8155)
DE: 1243 Space geodetic surveys
DE: 8107 Continental neotectonics
DE: 8123 Dynamics, seismotectonics
DE: 8155 Plate motions--general
SC: Geodesy [G]
MN: 2003 Fall Meeting