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《Acta Geodaetica et Cartographica Sinica》 2011-06
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Rupture Characteristic and Slip Constrained by GPS Coseismic Deformation Induced by the Wenchuan Earthquake

TAN Kai,QIAO Xunjun,YANG Shaomin,WANG Qi Crustal Movement Laboratory,Institute of Seismology,CEA,Wuhan 430071,China  
In order to study the Wenchuan MW7.9 earthquake rupture characteristic and slip,the dense GPS coseismic deformation is modeled by using simulated annealing algorithm based on uniform elastic half-space model.It's showed that the GPS coseismic deformation can be modeled well using at least five rupture segments from Yingxiu to Beichuan combined with one rupture segment from Guanxian to Jiangyou,and the result is better than one which is inferred from seismic wave data or InSAR data.The rupture along Yingxiu-Beichuan is 255~294 km in length.The south segment can be separated into the upper and the lower two layers,and is 30 km depth characterized by dip-slip reverse faulting.The mid-segment characterized by right lateral oblique faulting and dip-slip reverse faulting,and the north segment characterized by right lateral oblique faulting.The shortest earthquake recurrence interval is 3 000-year at Yingxiu segment.The rupture depth 14 km of upper layer is probably the locking depth along the Longmenshan fault.The Wenchuan earthquake maybe arised from block relatively moving and extrusion,sliping at depth or locking at shallow,and break out at weakness.
【Fund】: 国家自然科学基金(40974012;40974011);; 国家科技支撑计划(2008BAC35B04-5);; 中国地震局地震研究所所长基金(IS201116013);; 地震科学联合基金(606001)
【CateGory Index】: P228.4;P315
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