| 5·12汶川地震地表破裂基本参数的再论证及其构造内涵分析 |
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| 引用本文： | 徐锡伟,陈桂华,于贵华,孙鑫喆,谭锡斌,陈立春,孙建宝,陈于高,陈文山,张淑萍,李康.5·12汶川地震地表破裂基本参数的再论证及其构造内涵分析[J].地球物理学报,2010,53(10):2321-2336. |
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| 作者姓名： | 徐锡伟 陈桂华 于贵华 孙鑫喆 谭锡斌 陈立春 孙建宝 陈于高 陈文山 张淑萍 李康 |
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| 作者单位： | 1. 中国地震局地质研究所国家活动断层研究中心,北京 100029;
2. 台湾大学地质科学系,台北 10617 |
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| 基金项目： | 国家自然基金课题，科学技术部国际合作项目 |
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| 摘 要： | 地震地表破裂基本参数是反演地震破裂过程的基本约束条件和预测其他活动断层地震危险性不可缺少的物理量.以野外地表破裂带重要观测点全站仪或差分GPS仪实测数据为基础,结合高分辨率遥感资料解译、先存断层陡坎构造地貌标志的识别、以及地形测绘资料的考证等,重新论证了5·12汶川地震地表破裂带展布样式、长度、最大同震位移值等基本参数.结果表明,地震地表破裂带长度可达240 km,最大垂直位移为6.5±0.5 m,最大右旋走滑位移4.9 m,基于倾角向下变缓逆断层模型推测汶川地震在龙门山推覆构造带中段产生了最大~7 m的地壳缩短量,说明青藏高原东缘横向逆断层为将高原内部东向水平运动转换为高原隆升的转换构造,这一研究结果有助于深化认识青藏高原东缘隆升机理.
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| 关 键 词： | 汶川地震 地震地表破裂带 最大同震位移 龙门山推覆构造带 青藏高原 |
| 收稿时间： | 2009-12-08 |
Reevaluation of surface rupture parameters of the 5·12 Wenchuan earthquake and its tectonic implication for Tibetan uplift |
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| XU Xi-Wei,CHEN Gui-Hua,YU Gui-Hua,SUN Xin-Ze,TAN Xi-Bin,CHEN Li-Chun,SUN Jian-Bao,CHEN Yuegau,CHEN Wen-Shan,ZHANG Shu-Ping,LI Kang.Reevaluation of surface rupture parameters of the 5·12 Wenchuan earthquake and its tectonic implication for Tibetan uplift[J].Chinese Journal of Geophysics,2010,53(10):2321-2336. |
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| Authors: | XU Xi-Wei CHEN Gui-Hua YU Gui-Hua SUN Xin-Ze TAN Xi-Bin CHEN Li-Chun SUN Jian-Bao CHEN Yuegau CHEN Wen-Shan ZHANG Shu-Ping LI Kang |
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| Institution: | 1. National Center for Active Fault Studies, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Department of Geosciences, National Taiwan University, Taipei 10617, China |
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| Abstract: | Parameters of earthquake surface ruptures are fundamental constraints for earthquake rupture process inversion and for seismic risk assessment of similar active faults. Based on in-situ measurements at the key observation sites along the earthquake surface ruptures using Total Stations and differential GPS receivers, interpretation of high resolution satellite images and tectonic landform analysis for preexisting fault scarps, the parameters, such as rupture length and its maximum offsets, of the 5·12 Wenchuan earthquake surface rupture zone are reassessed. The results indicate that its length reaches 240 km and the maximum coseismic vertical offset is ~6.5 m measured at north Qushan Town, while its right-lateral slip is ~4.9 m at south Pingtong Town. The maximum vertical offset corresponds to a crustal shortening of ~7 m, and this implies that structural transformation from crustal shortening in the Longmenshan to the uplift along the Longmenshan thrust belt may be responsible for the growth of high topography along the eastern margin of the Tibetan Plateau. |
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| Keywords: | Wenchuan earthquake Earthquake surface rupture zone Maximum coseismic offset Longmenshan thrust belt Tibetan Plateau |
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