| 2008年汶川地震震源区东北端局部形变区与青川MS6.4强余震关系 |
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| 引用本文： | 倪四道,周勇,钱韵衣,罗新宇,王向腾.2008年汶川地震震源区东北端局部形变区与青川MS6.4强余震关系[J].地震学报,2018,40(3):268-278. |
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| 作者姓名： | 倪四道 周勇 钱韵衣 罗新宇 王向腾 |
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| 作者单位： | 1.中国武汉 430077 中国科学院测量与地球物理研究所 |
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| 基金项目： | 国家然科学基金（41461164003） |
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| 摘 要： | 2008年汶川地震之后，通过InSAR观测到青川县木鱼镇附近存在一个长约为15 km、宽约为10 km、地表位移数十厘米的局部形变区。前人分析认为，该形变区是由MS6.4的青川强余震造成的，但拟合地表形变数据所采用的震源深度和震源机制解与地震学反演的结果具有较大差异。本文利用远震体波和瑞雷波振幅谱进一步测定了青川强余震的震源深度和震源机制解，计算了此次事件造成的地表位移场，认为青川强余震并非造成木鱼镇地区局部形变的直接原因，并讨论该局部形变区可能的成因。
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| 关 键 词： | 震源深度 震源机制 地表形变 InSAR |
| 收稿时间： | 2018-01-22 |
Are there links between the localized deformation in the northeastern section of Wenchuan earthquake source zone and the May 25，2008 Qingchuan strong aftershock? |
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| Institution: | 1.Institute of Geodesy and Geophysics，Chinese Academy of Sciences，Wuhan 430077，China2.Department of Earth and Space Sciences，Southern University of Science and Technology，Shenzhen 518055，China3.School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China |
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| Abstract: | A localized deformation zone near Muyu town of Qingchuan county was observed on the InSAR interferograms of the great 2008 Wenchuan earthquake. The Muyu deformation zone was about 15 km long and 10 km wide, with line of sight displacement up to dozens of centimeters. Some researchers proposed that the deformation zone is caused by a strong aftershock （MW6.1） in Qingchuan county on May 25, 2008, and they adopted seismic source parameters very different from seismic inversions. To verify reliability of the seismic source inversions, we use teleseismic body wave and local Rayleigh wave spectra to constrain focal depth and fault plane of the strong aftershock. Thereafter, we compute ground displacement and proposed that the aftershock was not the direct cause of the localized deformation zone. Then we discuss some candidate mechanisms which might explain the localized deformation. |
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