徐锡伟2,,,
李康2
1. 东华理工大学地球物理与测控技术学院, 南昌 330013
2. 中国地震局地壳应力研究所, 地壳动力学重点实验室, 北京 100085
基金项目: 国家重点研发计划项目(2018YFC1504104),国家自然科学基金专项项目(41941016),中国地震局地震科技星火计划(XH18008Y),东华理东大学博士科研启动基金(DHBK2019075)和河北省地震局创新团队项目(DZ20180319009)联合资助
详细信息
作者简介: 宫猛, 男, 1983年生, 博士, 副研究员, 主要从事数字地震学与地震危险性研究.E-mail:mrgongm@163.com
通讯作者: 徐锡伟, 男, 研究员, 主要从事活动构造与地震关系研究.E-mail:xiweixu@vip.sina.com
中图分类号: P315收稿日期:2019-09-08
修回日期:2020-02-18
上线日期:2020-03-05
Fault geometry responsible for the initial rupture process of Wenchuan earthquake
GONG Meng1,,XU XiWei2,,,
LI Kang2
1. East China University of Technology, School of Geophysics and Measurement-Control Technology, Nanchang 330013, China
2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
More Information
Corresponding author: XU XiWei,E-mail:xiweixu@vip.sina.com
MSC: P315--> Received Date: 08 September 2019
Revised Date: 18 February 2020
Available Online: 05 March 2020
摘要
摘要:本文收集使用紫坪铺水库台网记录到的汶川地震主震P波波形资料,利用P波反投影叠加法获取了2008年5月12日汶川MW7.9地震起始破裂的时空演化过程.通过分析本次大地震起始破裂阶段(0~1 s)破裂点在三维空间内的分布特征,确定了本次大地震起始破裂位置及起始破裂断层几何结构模型.得到以下结果:汶川地震起始破裂点位于31.013±0.002°N、103.392±0.002°E,震源深度为8.2±0.4 km,发震时刻为2008年5月12日14:27:58.80±0.4.汶川地震起始破裂的最佳断层面走向为NE48°,倾向NW35°,起始阶段破裂的深度范围为地下7.5~9 km.
关键词: 汶川地震/
P波反投影/
起始破裂/
断层几何结构
Abstract:We study the initial rupture process of the 2008 MW7.9 Wenchuan earthquake, using the P-wave phases recorded by a near-source seismic array deployed in the Zipingpu reservoir region. The geometric structural model of the initial rupture fault is studied, based on the three-dimensional spatial distributions of the initial rupture positions. The results show that the initial rupture of the Wenchuan earthquake is located at 31.013±0.002°N and 103.392±0.002°E with a focal depth of 8.2±0.4 km, at 14:27:58.80±0.4 on May 12, 2008. The optimal fault plane of initial rupture of Wenchuan earthquake is NE48°, dip angle NW35°, and the depth variation of initial rupture process is from 7.5 to 9 km.
Key words:Wenchuan earthquake/
P-wave back-projection/
Initial rupture process/
Fault geometry
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