HR: 10:50h
AN: T32B-03    [Abstracts]
TI: Evidence For An Earthquake Barrier Model From Mw7.8 Kokoxili (Tibet) Earthquake Slip-Distribution
AU: * Klinger, Y
EM: klinger@ipgp.jussieu.fr
AF: Lab. Tectonique - Institut de physique du Globe Paris, IPGP - BP89 4 place Jussieu, Paris, 75005 France
AU: Michel, R
EM: remi.michel@cea.fr
AF: LDG - CEA, BP12, BruyŠres-le-Chƒtel, 91680 France
AU: King, G C
EM: king@ipgp.jussieu.fr
AF: Lab. Tectonique - Institut de physique du Globe Paris, IPGP - BP89 4 place Jussieu, Paris, 75005 France
AU: Tapponnier, P
EM: tapponnier@ipgp.jussieu.fr
AF: Lab. Tectonique - Institut de physique du Globe Paris, IPGP - BP89 4 place Jussieu, Paris, 75005 France
AB: The slip distribution of the Mw~7.8 Kokoxili (Tibet, 2001) earthquake has been measured at high resolution using optical correlation of Spot satellite images, which provides both the parallel and perpendicular components of the horizontal co-seismic slip. This reveals a variation of the horizontal slip at a scale of ~20km along-strike. Anti-correlation of slip parallel and perpendicular to the fault indicates transfer of slip from the horizontal to the vertical component at the ends of segments. These features suggest a rupture model with segments separated by strong persistent geometric barriers. The unexpected ending of the rupture south of the main fault can be explain by such a structure, which bears important implications for the initiation and rupture directivity of the next earthquake.
DE: 1209 Tectonic deformation (6924)
DE: 1242 Seismic cycle related deformations (6924, 7209, 7223, 7230)
DE: 7209 Earthquake dynamics (1242)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
SC: Tectonophysics [T]
MN: Fall Meeting 2005