| 2010年青海玉树地震(Ms7.1)同震地表破裂及其与山脉隆升的关系 |
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| 引用本文： | 吴富峣,李海兵,潘家伟,李 宁,郭瑞强,张 伟.2010年青海玉树地震(Ms7.1)同震地表破裂及其与山脉隆升的关系[J].地质通报,2011,30(4):612-623. |
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| 作者姓名： | 吴富峣 李海兵 潘家伟 李 宁 郭瑞强 张 伟 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037;国土资源部大陆动力学重点实验室,北京,100037
2. 四川省地矿局109地质大队,四川,成都,610100 |
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| 基金项目： | 国家科技支撑项目《汶川地震断裂带科学钻探》和中国地调局项目《青藏高原北缘和东缘大型断裂带与地震活动》 |
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| 摘 要： | 野外调查发现，2010年4月14日青海玉树Ms7.1级地震同震地表破裂带长约65km，破裂带走向为310°，破裂面向NE陡倾，地表破裂带由2部分组成，其中西侧部分长约19km，东侧部分长约30km，两者之间存在约15km的无破裂区。地表破裂以右阶雁行状破裂分布为主要特征，呈现左旋走滑性质，伴随有垂直位移。统计结果显示，同震地表破裂垂直位移 (dv)与水平位移 (dh)的比值在0.13~0.53之间，地貌累积dv与累积dh比值为0.27~0.63。同震dv/dh与地貌dv/dh的相似显示玉树南山的形成和玉树地震具有同样的运动学和动力学性质，玉树南山的形成是地质历史上沿玉树断裂多次类似于玉树地震的地震活动的结果，计算出需要1800~2600次地震才能造成玉树南山的隆升。前人研究本段断层地震复发周期为120~200年，计算出断层开始活动时间不晚于20万~40万年以前。
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| 关 键 词： | 玉树地震 地表破裂 dv/dh 山脉隆升 |
Co-seismic surface rupture of 2010 Yushu earthquake (Ms7.1), Qinghai, China and its correlation with mountain uplift |
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| WU Fu-yao,LI Hai-bing,PAN Jia-wei,LI Ning,GUO Rui-qiang,ZHANG Wei.Co-seismic surface rupture of 2010 Yushu earthquake (Ms7.1), Qinghai, China and its correlation with mountain uplift[J].Geologcal Bulletin OF China,2011,30(4):612-623. |
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| Authors: | WU Fu-yao LI Hai-bing PAN Jia-wei LI Ning GUO Rui-qiang ZHANG Wei |
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| Institution: | 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Key Laboratory for Continental Dynamics, Ministry of Land and Resources, Beijing 100037, China;3. 109 Geological Party, Sichuan Bureau of Geology and Mineral Exploration and Development, Chengdu 610010, Sichuan, China |
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| Abstract: | In field investigation we found that Qinghai Yushu Ms7.1 earthquake occurred on April 14, 2010 produced a ~65 km long co-seismic surface rupture zone which strikes 310° and dips NE. The entire zone is composed of two parts: the west section is about 19 km long and the east section is 30 km. Between these two sections, a 15 km long zone surface rupture gap is observed. Surface ruptures displayed common sinistral lines mainly featuring right stepping en-echelon ruptures, while vertical offsets developed. The ratios between co-seismic vertical offset and horizontal offset range from 0.13 to 0.53, while the geomorphic dv/dh values of 0.27~0.63 are close to co-seismic dv/dh (0.13~0.53), indicating that the Yushu Nanshan uplift probably showed the same kinematic and dynamic characteristics. In other words, the Yushu Nanshan uplift is resulting from the cumulative vertical offsets produced by many earthquakes similar to Yushu earthquake along Yushu fault in the geological history. We conclude that we need 1800~2600 earthquakes similar to Yushu earthquake to form Yushu Nanshan. Former researchers reckon the recurrence period of the Yushu section of Ganzi-Yushu fault zone to be 120-200 years, which would make us believe that this fault section's activity started from 200~400 ka ago. |
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| Keywords: | Yushu earthquake surface rupture dv/dh mountain uplift |
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