| 基于Pn/Pg相对定位方法研究2017年8月8日九寨沟M7.0地震起始破裂深度 |
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| 引用本文： | 魏星,王向腾,李志伟,王烁帆,黄志斌,刘杰.基于Pn/Pg相对定位方法研究2017年8月8日九寨沟M7.0地震起始破裂深度[J].地球物理学报,2019,62(4):1300-1311. |
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| 作者姓名： | 魏星 王向腾 李志伟 王烁帆 黄志斌 刘杰 |
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| 作者单位： | 1. 中国科学技术大学地球与空间科学学院, 合肥 230026;2. 中国地震台网中心, 北京 100045;3. 东华理工大学核资源与环境国家重点实验室, 南昌 330013;4. 中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 武汉 430077 |
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| 基金项目： | 国家自然科学基金（41774069）资助. |
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| 摘 要： | 本文利用Pn/Pg相对定位方法，测定了2017年8月8日四川九寨沟M7.0主震及部分余震的起始破裂深度.地震的起始破裂深度是理解地震孕震机理的重要参数，而九寨沟地区台网稀疏，地壳速度结构复杂，基于传统的到时定位方法测定地震起始破裂深度误差较大.Pn/Pg相对定位方法首先基于流动观测近台记录对2017年8月10日M4.1和11月7日M4.5余震震源位置进行测定，选择其为参考事件，再利用Pg校正主震水平位置，Pn约束震源起始深度，基于参考事件可以有效降低速度模型对震源位置测定的影响.结果显示：九寨沟主震起始破裂深度约9 km，早期余震的震源深度分布在7~13 km，主要集中在主震起始破裂深度附近.
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| 关 键 词： | 九寨沟地震 起始深度 Pn/Pg相对定位方法 台网稀疏 |
| 收稿时间： | 2018-01-09 |
Initial rupture depth of the 8 August 2017 M7.0 Jiuzhaigou earthquake derived from Pn/Pg relative location |
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| WEI Xing,WANG XiangTeng,LI ZhiWei,WANG ShuoFan,HUANG ZhiBin,LIU Jie.Initial rupture depth of the 8 August 2017 M7.0 Jiuzhaigou earthquake derived from Pn/Pg relative location[J].Chinese Journal of Geophysics,2019,62(4):1300-1311. |
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| Authors: | WEI Xing WANG XiangTeng LI ZhiWei WANG ShuoFan HUANG ZhiBin LIU Jie |
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| Institution: | 1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2. China Earthquake Networks Center, Beijing 100045, China;3. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;4. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China |
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| Abstract: | We used the Pn/Pg relative location method to locate the initial rupture depth of the Jiuzhaigou M7.0 earthquake and some aftershocks. Due to sparse seismograph network and complex three-dimensional crustal velocity structure, it is difficult to accurately determine this parameter by the traditional seismic arrival-time location method. In this study, we measured the hypocenter location of August 10, 2017 M4.1 aftershock and 7 November 2017 M4.5 aftershock with portable seismographic observation records, and selected them as reference events. Then we used Pg phase to adjust the horizontal location and Pn phase to determine the hypocentral depth. The influence of the velocity model was reduced effectively using the Pn/Pg relative location method. The results show that the initial rupture depth of the main shock is about 9 km, and the aftershocks are distributed at 7~13 km depths, mainly in the vicinity of the hypocentral depth of the main shock. |
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| Keywords: | Jiuzhaigou earthquake Hypocentral depth Pn/Pg relative location method Sparse network |
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