HR: 1340h
AN: S53A-1082    [Abstracts]
TI: Properties of seismic and surface deformation generated by earthquakes on a heterogeneous strike slip fault in elastic half space
AU: * Zoeller, G
EM: zoeller@rz.uni-potsdam.de
AF: University of Potsdam, Institute of Physics POB 60 15 53, Potsdam, 14415 Germany
AU: Ben-Zion, Y
EM: benzion@usc.edu
AF: University of Southern California, Department of Earth Sciences, Los Angeles, CAL CA 90089-0 United States
AU: Holschneider, M
EM: hols@math.uni-potsdam.de
AF: University of Potsdam, Institute of Mathematics POB 60 15 53, Potsdam, 14415 Germany
AU: Hainzl, S
EM: hainzl@geo.uni-potsdam.de
AF: University of Potsdam, Department of Geociences POB 60 15 53, Potsdam, 14415 Germany
AB: We use a model of a discrete 2D strike-slip fault in a 3D elastic half space to investigate patterns of surface deformation for different sets of fault properties. The basic model, proposed by Ben-Zion and Rice (1993), is governed by realistic boundary conditions, static-kinetic friction, and 3D elastic stress transfer. Recent studies extended the model to incorporate (1) quasidynamic rupture propagation, (2) gradual healing, and (3) creeping barriers (Zöller et al., 2004, 2005). The model produces for ranges of input parameters realistic frequency-size and temporal statistics, realistic hypocenter distributions, realistic foreshock-mainshock-aftershock sequences, and accelerating seismic release. Previous works have shown that the model behavior can be mapped onto phase diagrams that span, as a function of input parameters, several different dynamic regimes (e.g., Dahmen et al., 1998). In the present study we extend to calculated observable quantities by examining systematically properties of surface deformation associated with different sets of model parameters. In particular, we examine the sensitivity of surface deformation patterns to variations in static-kinetic friction and creep fault properties. Our initial calculations focused on surface formation produced by mainshocks generated by end-member cases. These include realizations for a fault near a critical state (associated with dynamic friction equal static friction and high disorder of properties) and far from criticality. The results indicate that the surface deformation field contains information that can be used to infer on the stress field on the fault and underlying fault parameters. We also address the possibility of classifying the dynamic regime that a fault belongs to by a joint study of model simulations and observed seismic and geodetic data.
DE: 7209 Earthquake dynamics (1242)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7290 Computational seismology
DE: 8118 Dynamics and mechanics of faulting (8004)
SC: Seismology [S]
MN: Fall Meeting 2005