The 14 November 2001, M-w = 7.8, Kokoxili earthquake ruptured more than 400 km of the westernmost stretch of the left-lateral Kunlun fault in northern Tibet. Interferometric synthetic aperture radar data from descending orbits, along four adjacent tracks covering almost the entire rupture, and 1-m pixel Ikonos satellite images are used to map the rupture geometry and the surface displacements produced by the event. Interferograms are then inverted to solve for coseismic slip on the fault at depth. The radar data show that the rupture connected the Heituo fault, where the earthquake initiated, to the main Kunlun fault, cutting across a pull-apart trough in between the two strike-slip faults. The fault model includes two vertical sections extending to a depth of 20 km and discretized into 5 km x 5 km patches. Using a nonnegative least squares method that includes an appropriate degree of smoothing, we solve for the left-lateral slip on each fault patch. Our solution shows that the largest slip occurred at depths between 0 and 5 km, reaching similar or equal to 8 m in two areas, 200 and 250 km east of the earthquake epicenter. Significant slip took place below 10 km at both ends of the rupture. Slip appears to have been highly variable along the fault, defining six sections of major moment release. These sections correspond to six subsegments of the Kunlun fault system, defined from the surface morphology of the fault. This suggests that fault geometry exerted a predominant influence on controlling the rupture propagation.
J. Geophys. Res.-Solid EarthISI Document Delivery No.: 999CZTimes Cited: 3Cited Reference Count: 49Cited References:ANTOLIK M, 2004, B SEISMOL SOC AM, V94, P1173BARKA AA, 1988, TECTONICS, V7, P663BOUCHON M, 2003, SCIENCE, V301, P824BOWMAN D, 2003, SCIENCE, V300, P1121CAKIR Z, 2003, GEOPHYS J INT, V155, P93CRAMPE F, 2000, EOS T AGU S, V81FARR TG, 2000, EOS T AGU, V81, P583FARR TG, 2000, EOS T AGU, V81, P585FIALKO Y, 2005, NATURE, V435, P295FITCH TJ, 1970, J GEOPHYS RES, V75, P2699FREYMUELLER J, 2003, GEOPH RES ABSTR, V5GOLDSTEIN R, 1995, GEOPHYS RES LETT, V22, P2517GU G, 1989, CATALOGUE CHINESE EAHARRIS RA, 1993, J GEOPHYS RES-SOL EA, V98, P4461JIA Y, 1988, RES EARTHQUAKE FAULT, P66JONSSON S, 2002, B SEISMOL SOC AM, V92, P1377KIDD WSF, 1988, PHILOS T ROY SOC A, V327, P337KING G, 2005, B SEISMOL SOC AM, V95, P731KLINGER Y, 2004, 3 INT C CONT EARTHQKLINGER Y, 2005, B SEISMOL SOC AM, V95, P1970LI HB, 2005, EARTH PLANET SC LETT, V237, P285LI LH, 1981, NW SEISMOL J, V3, P61LIN AM, 2002, SCIENCE, V296, P2015MASSONNET D, 1993, NATURE, V364, P138MOLNAR P, 1989, GEOPHYS J INT, V99, P123OKADA Y, 1992, B SEISMOL SOC AM, V82, P1018PELTZER G, 1999, SCIENCE, V286, P272RIVERA L, 2003, GEOPH RES ABSTR, V5ROSEN PA, 2000, P IEEE, V88, P333ROSEN PA, 2004, EOS T AGU, V85, P47SHEN ZK, 2003, GEOPH RES ABSTR, V5SIMONS M, 2002, B SEISMOL SOC AM, V92, P1390STEIN RS, 1997, GEOPHYS J INT, V128, P594TAPPONNIER P, 1977, J GEOPHYS RES, V82, P2905TAPPONNIER P, 2001, SCIENCE, V294, P1671VALLEE M, 2003, GEOPH RES ABSTR, V5VANDERWOERD J, 1998, GEOLOGY, V26, P695VANDERWOERD J, 2000, GEOPHYS RES LETT, V27, P2353VANDERWOERD J, 2002, GEOPHYS J INT, V148, P356VANDERWOERD J, 2002, SEISMOL RES LETT, V73, P125VANDERWOERD J, 2003, GEOPH RES ABSTR, V5VELASCO AA, 2000, J GEOPHYS RES-SOL EA, V105, P28065WANG M, 2003, GEOPH RES ABSTR, V5WANG Q, 2001, SCIENCE, V294, P574WRIGHT TJ, 2003, GEOPHYS RES LETT, V30XU X, 2002, SEISMOL RES LETT, V73, P884XU X, 2003, GEOPH RES ABSTR, V5ZEBKER HA, 1992, IEEE T GEOSCI REMOTE, V30, P950ZEBKER HA, 1994, J GEOPHYS RES-SOL EA, V99, P19617B12408