%0 Journal Article
%T Co-seismic slip and slip partitioning of multi-faults during the MS8.0 2008 Wenchuan earthquake<br>2008年汶川MS8.0地震多断裂破裂的近地表同震滑移及滑移分解
%A CHEN Gui-Hua
%A XU Xi-Wei
%A YU Gui-Hua
%A AN Yan-Fen
%A YUAN Ren-Mao
%A GUO Ting-Ting
%A GAO Xiang
%A YANG Hu
%A TAN Xi-Bin
%A <br>陈桂华
%J 地球物理学报
%D 2009
%I 
%X In order to study the kinematical mechanism of the co-seismic rupture of the 2008 Wenchuan earthquake, we implemented a detailed surveying and mapping in some typical sites with geological and geomorphologic marks, and calculated the three dimension slip vectors. The northwestern hanging wall of Baishuihe-Gaochuan rupture associated with the Beichuan-Yingxiu fault slipped in an azimuth of 88°, with 2.58 m of horizontal slip and 3.70 m of vertical slip; The northwestern hanging wall of Bailu-Hanwang rupture associated with the Anxian-Guanxian fault slipped in an azimuth of 134°, with 1.63 m of horizontal slip and 2.00 m of vertical slip; The southwestern hanging wall of Xiaoyudong rupture slipped with an azimuth of 76°~79°, 2.15~2.71 m of horizontal slip and 1.36~1.51 m of vertical slip. There are totally about 1.72 m of strike slip and 3.49m of horizontal shortening perpendicular to the fault zone from the paralleling Baishuihe-Gaochuan and Bailu-hanwang ruptures. The integrated slip vector (trending 106°) has an angle of 64° with the fault zone (trending 42°) , and the Longmenshan fault zone was under a transpression. Combining the result from source inversions, we propose that the oblique-slipping Baishuihe-Gaochuan rupture and the dip-slipping Bailu-Hanwang rupture were produced in the same time during the largest sub-event with a slip partitioning, and the mechanism of slip partitioning made the two faults ruptured with an oblique slip and a dip slip, but not all the same oblique slip. The Xiaoyudong rupture slipped in a relatively small dip angle, which acted as a trigger structure for the simultaneous rupture of Beichuan-Yingxiu fault and Anxian-Guanxian fault in a manner of slip partitioning. The Xiaoyudong fault was the production of the Longmenshan fault zone under the transpressional tectonics in a long term, not only a tear fault among the thrust system.
%K The 2008 Wenchuan earthquake
%K Co-seismic rupture
%K Slip partitioning
%K Beichuan-Yingxiu fault
%K Anxian-Guanxian fault
%K Xiaoyudong fault<br>汶川地震
%K 同震地表变形
%K 滑移分解
%K 北川—映秀断裂
%K 安县—灌县断裂
%K 小鱼洞断裂
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=2CB9888CE6BAD76096E33EFF974C3FB7&yid=DE12191FBD62783C&vid=286FB2D22CF8D013&iid=94C357A881DFC066&sid=7A60741D2B519BE0&eid=C919C6DD1115AFC0&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=0&reference_num=0