HR: 08:15h
AN: S31A-02    [PDF]
TI: Slip Partitioning and the Regional Stress Field
AU: * Bowman, D
EM: dbowman@fullerton.edu
AF: California State University, Fullerton, 800 N. State College Blvd, Fullerton, CA 92834-6850 United States
AU: * Bowman, D
EM: dbowman@fullerton.edu
AF: Institut de physique du Globe de Paris, 4, place jussieu, Paris, 75252 France
AU: King, G
EM: king@ipgp.jussieu.fr
AF: Institut de physique du Globe de Paris, 4, place jussieu, Paris, 75252 France
AU: Klinger, Y
EM: klinger@ipgp.jussieu.fr
AF: Institut de physique du Globe de Paris, 4, place jussieu, Paris, 75252 France
AU: Tapponnier, P
EM: tappon@ipgp.jussieu.fr
AF: Institut de physique du Globe de Paris, 4, place jussieu, Paris, 75252 France
AB: Oblique motion along tectonic boundaries is commonly partitioned into slip on several faults with different senses of motion. This partitioning can be explained by the upward propagation of a localized fault at depth. The static stress field ahead of the propagating fault separates into zones of predominantly normal, reverse and strike-slip faulting. Elastic approximations to plastic behavior have been used to explain the distribution of faults observed along the San Andreas (California, USA) and the Haiyuan faults (Tibet, China). Slip partitioning in a single earthquake rupture has also been documented for the 2001 Kokoxili, Tibet earthquake. This process has important implications for regional stress fields in areas where the strain is partitioned onto structures with different senses of motion. In particular, the notion of a partitioned stress field driven by slip at depth can be used to generate a realistic background stress field for models of Coulomb stress interactions. This can be incorporated into more accurate calculations of the stress interactions in aftershock sequences of large earthquakes, which is crucial to determining real-time aftershock probabilities.
DE: 7218 Lithosphere and upper mantle
DE: 7223 Seismic hazard assessment and prediction
DE: 7230 Seismicity and seismotectonics
DE: 8110 Continental tectonics--general (0905)
DE: 8123 Dynamics, seismotectonics
SC: Seismology [S]
MN: 2003 Fall Meeting