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| 汶川大地震（MS 8.0）同震变形作用及其与地质灾害的关系 | |
| 引用本文： | 付小方,侯立玮,李海兵,王宗秀,邹付戈.汶川大地震（MS 8.0）同震变形作用及其与地质灾害的关系[J].地质学报,2008,82(12):1733-1746. |
| 作者姓名： | 付小方 侯立玮 李海兵 王宗秀 邹付戈 |
| 作者单位： | 1. 四川省地质调查院,成都,610081 2. 中国地质科学院地质研究所,北京,100037 3. 中国地质科学院地质力学研究所,北京,100081 4. 俄克拉荷马大学,康菲地质与地球物理学院,美国,73072 |
| 基金项目： | 国家科技支撑项目“汶川地震断裂带科学钻探”资助成果 |
| 摘 要： | 2008年5月12日发生于四川盆地西部龙门山断裂带的汶川大地震（MS 8.0）波及半个亚洲，震撼整个中国。本文通过地震后的实地调查，对发育在龙门山断裂带上的同震地表破裂带的分布、产状、继承性复活与变形特征，以及同震变形与地震地质灾害的关系等进行了初步总结，分析表明这次汶川大地震(MS 8.0)沿北川-映秀逆冲断裂和安县-灌县逆冲断裂同时发生地表破裂，前者产生以高角度逆冲兼右旋走滑为特征的地表破裂带长约275 km，后者产生以缓倾角逆冲作用为特征的地表破裂带长约80 km。汶川大地震的同震地表破裂带分布具有分段性特征，并与地表破坏程度的分带性有着一定的内在联系，详细研究表明，同震地表破裂带的产状直接影响地表破坏程度和地震地质灾害的强度，汶川大地震（MS 8.0）沿呈高角度陡倾的北川-映秀逆冲断裂发育的同震地表变形所产生的地表破坏程度和地震地质灾害的强度比沿缓倾角的安县-灌县逆冲断裂要强。从各种类型的地震断裂来看，具有垂直运动的逆冲型地震断裂所造成的地表破坏程度和地质灾害强度比具水平运动的走滑型地震断裂要强。因此，汶川大地震发生的破裂过程和同震地表变形与地震地质灾害的关系值得深入研究。 |
| 关 键 词： | 汶川大地震（MS 8.0） 同震变形 破坏程度 地质灾害 |
| 收稿时间： | 2008/10/8 0:00:00 |
| 修稿时间： | 2008/12/2 0:00:00 |
Coseismic Deformation of the MS 8.0 Wenchuan Earthquake and Its Relationship with Geological Hazards |
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| FU Xiaofang,HOU Liwei,LI Haibing,WANG Zongxiu and ZOU Fuge.Coseismic Deformation of the MS 8.0 Wenchuan Earthquake and Its Relationship with Geological Hazards[J].Acta Geologica Sinica,2008,82(12):1733-1746. | |
| Authors: | FU Xiaofang HOU Liwei LI Haibing WANG Zongxiu and ZOU Fuge |
| Institution: | Sichuan Geological Survey, Chengdu, Sichuan, 610081;Sichuan Geological Survey, Chengdu, Sichuan, 610081;Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081;ConocoPhillips School of Geology and Geophysics, the University of Oklahoma, OK, 73072, USA |
| Abstract: | Based on post-earthquake field investigation, we summarized the distribution, occurrence, inherited reactivation and deformation features of the co-seismic surface ruptures developed on the Longmenshan fault system, together with the relationship between coseismic deformation and earthquake geological hazards. Systematic research indicates that the surface rupture occurred simultaneously along the Beichuan-Yingxiu fault and the Anxian-Guanxian fault; the former is 275 km long and characterized by high angle thrust and dextral strike-slip, while the latter is 80km long and characterized by flat thrust. Further analysis also reveals the inner relations between segmentation of coseismic surface rupture and zonation of surface damage associated with the Wenchuan earthquake. Surface damages and earthquake geological disasters are affected directly by the occurrence of coseismic surface rupture zone, for example, damages and hazards developed along the high angle Beichuan-Yingxiu thrust fault are much more serious than that along the flat Anxian-Guanxian thrust fault. As for various seismic faults, the degree of surface deconstruction and geological disaster produced by thrust-type seismic fault with vertical motion is higher than that by strike-slip-type seismic fault with horizontal motion. Therefore, the relation between the earthquake geological disasters and the rupture process of the Wenchuan earthquake together with the associated coseismic surface deformation need further study. |
| Keywords: | MS 8 0 Wenchuan earthquake coseismic rupture damage degree geological disaster |
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