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《Seismology and Geology》 2008-03
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QUANTITATIVE ANALYSIS OF THE CO-SEISMIC SURFACE RUPTURE OF THE 2008 WENCHUAN EARTHQUAKE,SICHUAN,CHINA ALONG THE BEICHUAN-YINGXIU FAULT

CHEN Gui-hua1) XU Xi-wei1) ZHENG Rong-zhang1) YU Gui-hua1) LI Feng1,2) LI Chen-xia1) WEN Xue-ze3) HE Yu-lin3) YE You-qing3)CHEN Xian-cheng1) WANG Zhi-cai4)1)National Center for Active Fault Studies,Institute of Geology,China Earthquake Administration,Beijing 100029,China2)China Earthquake Disaster Prevention Center,Beijing 100029,China3)Earthquake Administration of Sichuan Province,Chengdu 610041,China4)Earthquake Administration of Shandong Province,Jinan 250014,China  
A 240km-long co-seismic surface rupture was produced along the Beichuan-Yingxiu Fault during the 2008 Wenchuan earthquake.We made a detailed survey at representative sites along the surface rupture and analyzed the data based on the geometry between the benchmark and deformation.The co-seismic vertical slip,horizontal dip-slip shortening,strike slip and moving direction of the hanging-wall were calculated based on the survey data of these sites.Results show that the spatial distribution of the co-seismic deformation of the fault varies a lot along the fault.The maximal horizontal slip,as we got till now,is located in the Shenxigou site of Hongkou with a value of 4.98m,and the maximal strike slip is also located in the same site with a value of 4.5m.The maximal vertical displacement is located to the northeast of Shenxigou with a value of 5.7~6.7m.The average horizontal slip for the NE trending fault is 1~2m,and the average vertical slip is 3m.But horizontal and vertical slip for the NW-trending branch from Xiaoyudong to Caoba is only 0.5~1.5m.The data from Leigu town show that the gravity deformation resulting from the fault-related landslide was perhaps superimposed on the tectonic one.The dip angles of the fault at the surveyed sites calculated from the horizontal shortening and vertical displacement indicate that the Beichuan-Yingxiu Fault is a steep dipping reverse fault with some strike-slip.From the comparison between field results and geophysical inversion,we believe that the spatial distribution of co-seismic fault-slip is related to the barriers and rupture process along the fault plane.
【Fund】: 中国地震局地质研究所基本科研业务专项(DFIGCEA060712);; 国家重点基础研究发展计划项目(2004CB418401);; 中国地震局汶川8.0级地震应急科学考察项目共同资助
【CateGory Index】: P315.2
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