| 汶川M_S 8.0地震基岩中的地表破裂 |
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| 引用本文： | 李细光,于贵华,徐锡伟.汶川M_S 8.0地震基岩中的地表破裂[J].地震地质,2008,30(4):989-995. |
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| 作者姓名： | 李细光 于贵华 徐锡伟 |
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| 作者单位： | 1. 广西壮族自治区地震局,南宁,530022
2. 中国地震局地质研究所,国家地震活动断层研究中心,北京,100029 |
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| 基金项目： | 中国地震局汶川8.0级地震应急科学考察项目;; 广西科学研究与技术开发计划项目(桂科攻08160066)共同资助 |
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| 摘 要： | 在汶川MS8.0地震中,地表破裂变形带多表现为挠曲坎或断层坎,地表基岩破裂少见,作者在安县肖家桥附近基岩中发现了出露完整的地震地表破裂带。在仔细分析该破裂带变形特征和内部结构构造的基础上,结合区域上地震地表破裂特点,认为:这次地震的地表破裂主要沿先存的映秀-北川断裂发生和扩展,地震断层作用形式以右旋斜冲运动为主,安县肖家桥附近映秀-北川断裂的最大垂直同震位错为5.4m,与通过挠曲坎或断层坎测量的结果基本一致
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| 关 键 词： | 汶川M_S 8.0地震 基岩地表破裂 映秀-北川断裂 同震位错 右旋斜冲运动 |
| 收稿时间： | 2008-12-18 |
SURFACE RUPTURES IN BEDROCK OF THE MS 8.0 WENCHUAN EARTHQUAKE |
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| LI Xi-guang,YU Gui-hua,XU Xi-wei.SURFACE RUPTURES IN BEDROCK OF THE MS 8.0 WENCHUAN EARTHQUAKE[J].Seismology and Geology,2008,30(4):989-995. |
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| Authors: | LI Xi-guang YU Gui-hua XU Xi-wei |
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| Abstract: | During the MS 8.0 Wenchuan earthquake,most of surface deformation zones show as flexural scarps or fault scarps,and surface ruptures in bedrock are rare.However,earthquake surface ruptures are entirely exposed in bedrock and discovered by authors near Xiaojiaqiao town of Anxian county.Based on careful analysis of the deformation characteristics and the inner structure of this rupture zone,and in combination with features of the regional earthquake surface ruptures,the authors hold that the earthquake surface ruptures are developed and extend mainly along the preexisting Yingxiu-Beichuan Fault during this earthquake,the faulting is right-reverse-slip movement at a low angle,and the maximum vertical co-seismic dislocation is 5.4 meters,which coincide with the measurements of the flexural scarps or fault scarps. |
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| Keywords: | M_S 8 0 Wenchuan earthquake surface rupture in bedrock the Yingxiu-Beichuan Fault co-seismic dislocation right-reverse-slip movement |
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