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李勇, 黄润秋, A.L.Densmore, 周荣军, 闫亮, 张毅, N.Richardson, 董顺利, 乔宝成, M.A.Ellis, 何玉林, 陈浩. 龙门山小鱼洞断裂在汶川地震中的地表破裂及地质意义[J]. 第四纪研究, 2009, 29(3): 502-512. doi: 10.3969/j.issn.1001-7410.2009.03.11
引用本文: 李勇, 黄润秋, A.L.Densmore, 周荣军, 闫亮, 张毅, N.Richardson, 董顺利, 乔宝成, M.A.Ellis, 何玉林, 陈浩. 龙门山小鱼洞断裂在汶川地震中的地表破裂及地质意义[J]. 第四纪研究, 2009, 29(3): 502-512. doi: 10.3969/j.issn.1001-7410.2009.03.11
李勇, 黄润秋, A.L.Densmore, 周荣军, 闫亮, 张毅, N.Richardson, 董顺利, 乔宝成, M.A.Ellis, 何玉林, 陈浩. 龙门山小鱼洞断裂在汶川地震中的地表破裂及地质意义[J]. 第四纪研究, 2009, 29(3): 502-512. doi: 10.3969/j.issn.1001-7410.2009.03.11 Li Yong, Huang Runqiu, A.L.Densmore, Zhou Rongjun, Yan Liang, Zhang Yi, . SURFACE RUPTURE OF XIAOYUDONG FAULT CAUSED BY WENCHUAN EARTHQUAKE AND ITS GEOLOGICAL SIGNIFICANCE[J]. Quaternary Sciences, 2009, 29(3): 502-512. doi: 10.3969/j.issn.1001-7410.2009.03.11
Citation: Li Yong, Huang Runqiu, A.L.Densmore, Zhou Rongjun, Yan Liang, Zhang Yi, . SURFACE RUPTURE OF XIAOYUDONG FAULT CAUSED BY WENCHUAN EARTHQUAKE AND ITS GEOLOGICAL SIGNIFICANCE[J]. Quaternary Sciences, 2009, 29(3): 502-512. doi: 10.3969/j.issn.1001-7410.2009.03.11
龙门山小鱼洞断裂在汶川地震中的地表破裂及地质意义
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①成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059;
②成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059;
③Institute of Hazard and Risk Research and Department of Geography, Durham University, Durham, UK;
④四川省地震局工程地震研究院, 成都 610041;
⑤Department of Earth Science, Swiss Federal Institute of Technology, Zurich, Switzerland;
⑥Center for Earthquake Research and Information, University of Memphis, Memphis, Tennessee, USA
详细信息
中图分类号: P315.2
收稿日期: 2009-03-01
修回日期: 2009-03-27
刊出日期: 2009-05-31
SURFACE RUPTURE OF XIAOYUDONG FAULT CAUSED BY WENCHUAN EARTHQUAKE AND ITS GEOLOGICAL SIGNIFICANCE
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①State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059;
②State Key Laboratory of Geohazard Prevention &|Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059;
③Institute of Hazard and Risk Research and Department of Geography, Durham University, Durham, UK;
④Institute of Earthquake Engineering, Seismological Bureau of Sichuan Province, Chengdu 610041;
⑤Department of Earth Science, Swiss Federal Institute of Technology, Zurich, Switzerland;
⑥Center for Earthquake Research and Information, University of Memphis, Memphis, Tennessee, USA
Received Date: 01 March 2009
Revised Date: 27 March 2009
Publish Date: 31 May 2009
Abstract: The MS8.0 earthquake occurred on May 12th,2008 in Longmenshan(Longmen Mountain)caused surface ruptures in the Yingxiu－Beichuan Fault，the Pengxian－Guanxian Fault，and a new fault，the Xiaoyudong Fault in the Xiaoyudong area in the middle segment of the Longmenshan(Pengzhou City，Sichuan Province). Detailed geological mapping and surveying on typical surface ruptures and fault belts were taken by GPS and EDM after the earthquake in this area, e.g.，including the measurement of vertical and horizontal offsets of all three faults. The results suggest that the plane fabric pattern of the surface rupture caused by the Wenchuan Earthquake in this area is consisting of two paralleled thrust faults，which are cut by the Xiaoyudong Fault. The Xiaoyudong Fault is located between the Yingxiu－Beichuan Fault and the Pengxian－Guanxian Fault with NWSE striking，and extends about 15km through the Xiaoyudong Bridge，and cuts a wide range of terrain units. Its southwest block is a hanging wall and the northeast block is a foot wall with an average vertical offset of 1.0 meter and an average horizontal offset of 2.3 meters. The ratio of the thrust to strikeslip componenet is 1∶1～1∶2，showing the vertical offset is smaller than the horizontal offset，and from south to north the thrust displacement is increasing. The surface rupture pattern in the Xiaoyudong area implies that the Xiaoyudong Fault is a tear fault which was formed by differential movements of thrust belt in Longmenshan during the Wenchuan Earthquake. It striked in the direction of tectonic thrusting from NW to SE and dipped at high angles with left slipping.
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收稿日期: 2009-03-01
修回日期: 2009-03-27
刊出日期: 2009-05-31
