魏星^1,2,,
王向腾^3,4,,,
李志伟⁴,
王烁帆⁴,
黄志斌²,
刘杰²
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

基金项目: 国家自然科学基金（41774069）资助


详细信息

作者简介: 魏星, 男, 1981年生, 中国科学技术大学地球与空间科学学院在读博士生, 中国地震台网中心高级工程师, 主要从事地震监测与震源参数研究.E-mail:weixing@seis.ac.cn

通讯作者: 王向腾, 男, 1989年生, 东华理工大学地球物理与测控技术学院讲师, 主要从事地震定位与震源参数研究.E-mail:wangxt@whigg.ac.cn

中图分类号: P315

收稿日期:2018-01-09
修回日期:2018-09-27
上线日期:2019-04-05

Initial rupture depth of the 8 August 2017 M7.0 Jiuzhaigou earthquake derived from Pn/Pg relative location

WEI Xing^1,2,,
WANG XiangTeng^3,4,,,
LI ZhiWei⁴,
WANG ShuoFan⁴,
HUANG ZhiBin²,
LIU Jie²
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


More Information

Corresponding author: WANG XiangTeng,E-mail:wangxt@whigg.ac.cn

MSC: P315

--> Received Date: 09 January 2018
Revised Date: 27 September 2018
Available Online: 05 April 2019


摘要
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.
关键词: 九寨沟地震/
起始深度/
Pn/Pg相对定位方法/
台网稀疏

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.
Key words:Jiuzhaigou earthquake/
Hypocentral depth/
Pn/Pg relative location method/
Sparse network



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