| 汶川M_S8.0地震中央断裂北段地表破裂特征 |
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| 引用本文： | 乔宝成,李勇,董顺利,闫亮,陈浩,马博琳.汶川M_S8.0地震中央断裂北段地表破裂特征[J].西北地震学报,2009,31(4):333-338,348. |
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| 作者姓名： | 乔宝成 李勇 董顺利 闫亮 陈浩 马博琳 |
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| 作者单位： | 成都理工大学地球科学学院,四川,成都,610059 |
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| 基金项目： | 国家自然科学基金，中国地质调查局应急项目，中石化前瞻性项目 |
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| 摘 要： | 研究了2008年汶川大地震的发震构造龙门山构造带的北段,即北川-南坝-林庵寺断裂的地表破裂.通过黄家坝、桂溪、平通、南坝、石坎子等地的考察和测量,显示该段地表破裂沿断裂带连续分布,走向为N45°～65°E.垂直位错与水平位错比值从西南段黄家坝的2.8:1逐渐降低到北东段南坝、石坎子的0.9:1.地表破裂特征表明,断裂以右旋走滑分量为主,并具有较高的逆冲分量.余震分布表明,青川断裂与北川-南坝-林庵寺断裂之间可能存在隐伏活动断裂.
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| 关 键 词： | 汶川M_s8.0地震 龙门山构造带 中央断裂 地表破裂 同震位移 |
The Surface Rupture of the M_s8.0 Wenchuan Earthquake on the Northern Segment of Central Fault |
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| QIAO?Bao-cheng,LI?Yong,DONG?Shun-li,YAN?Liang,CHEN?Hao and MA?Bo-lin.The Surface Rupture of the M_s8.0 Wenchuan Earthquake on the Northern Segment of Central Fault[J].Northwestern Seismological Journal,2009,31(4):333-338,348. |
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| Authors: | QIAO?Bao-cheng LI?Yong DONG?Shun-li YAN?Liang CHEN?Hao and MA?Bo-lin |
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| Institution: | College?of?Earth?Sciences,Chengdu?University?of?Technology;College?of?Earth?Sciences,Chengdu?University?of?Technology;College?of?Earth?Sciences,Chengdu?University?of?Technology;College?of?Earth?Sciences,Chengdu?University?of?Technology;College?of?Earth?Sciences,Chengdu?University?of?Technology;College?of?Earth?Sciences,Chengdu?University?of?Technology |
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| Abstract: | The Surface rupture of Beichuan-Nanba-Linanshi Fault, which is the northern seg-ment of Longmenshan tectonic belt is studied. Observation at Huangjiaba,Guixi, Pingtong, Nan-ba and Shikanzi suggests that the surface ruptures on this segment spread continuously along the trend of the fault with N45°～65°E in general. The rate of vertical offset and horizontal offset be-come small from Huangjiaba(2.8:1) to Shikanzi (0.9:1). Features of surface rupture indicate that the fault movement is thrusts with dextral strike-slip. Distribution of aftershocks indicates that the area between Beichuan-Nanba-Linanshi Fault and Qingchuan Fault probably have a buried active fault. |
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| Keywords: | M_s8 0 Wenchuan earthquake Longmenshan tectonic belt Central fault Surface rup-ture Coseismic displacement |
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