| 基于勒夫波的鲁甸MS6.5地震震源复杂性分析 |
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| 引用本文： | 许力生,张旭,严川,李春来.基于勒夫波的鲁甸MS6.5地震震源复杂性分析[J].地球物理学报,2014,57(9):3006-3017. |
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| 作者姓名： | 许力生 张旭 严川 李春来 |
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| 作者单位： | 中国地震局地球物理研究所, 北京 100081 |
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| 基金项目： | 地震行业专项（201408014）和中国地震局地球物理研究所基本业务费（DQJB12C01）联合资助. |
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| 摘 要： | 2014年8月3日，云南省鲁甸县发生了MS6.5地震，造成600余人死亡，震害之大出人预料. 我们利用经验格林函数技术从国家地震台网记录的宽频带勒夫波提取了视震源时间函数，通过分析其方位依赖性获得了关于震源结构与能量辐射复杂性的认识，进而讨论了它们与震害之间的关系. 对视震源时间函数的分析表明，能量释放的时间过程比较简短，83%的能量集中释放于前10 s，但这次地震发生于两个走向分别为60°和150°左右的相互交叉的断层，破裂开始于60°取向的断层，起初以双侧破裂为主，后来向60°方位的传播占优势，但很快触动了150°取向的断层，同样，起初以双侧破裂为主，后来向150°方位的传播占优势. 由于两条断层同时参与了这次地震，近场能量辐射具有较强的方位复杂性，其中60°~210°方位能量辐射较强. 所以，能量释放时间过程之简短但交叉的震源结构和依赖于方位的能量辐射应该是造成如此震害的主要原因.
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| 关 键 词： | 鲁甸MS6.5地震 勒夫波 视震源时间函数 震源复杂性 |
| 收稿时间： | 2014-09-08 |
Analysis of the Love waves for the source complexity of the Ludian MS6.5 earthquake |
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| XU Li-Sheng,ZHANG Xu,YAN Chuan,LI Chun-Lai.Analysis of the Love waves for the source complexity of the Ludian MS6.5 earthquake[J].Chinese Journal of Geophysics,2014,57(9):3006-3017. |
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| Authors: | XU Li-Sheng ZHANG Xu YAN Chuan LI Chun-Lai |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | An MS6.5 earthquake struck the Ludian county, Yunnan province, on Aug.3, 2014. The earthquake killed over 600 people, and resulted in the unexpected loss. We obtained the knowledge of the complexities of the source structure and energy radiation from analysis of the azimuth-dependent apparent source time functions (ASTFs), which are retrieved from the Love waves recorded by the broadband stations of the National Seismograph Network of China using the empirical Green's function technique, and had a discussion on the relation between the complexities and the loss. The analysis of the ASTFs shows, that the temporal process of energy release was simple and short, with the 83% being released within the first 10 s, that but two intersected faults were involved into the earthquake, which orient in directions of about 60° and 150°, respectively, that the rupture started on the 60°-oriented fault in bilateral manner, and later dominantly propagated to 60° direction and trigged the other fault, and that the rupture on the second fault also started in bilateral manner, but later dominantly propagated to 150° direction. Because of the involvement of the two faults, the energy radiation in near field had a complicated pattern. The stronger radiation covered azimuths of 60°~210°. Thus, the unexpected loss should be attributed to the simple and short temporal process but the intersected source structure and azimuth-dependent energy radiation. |
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| Keywords: | Ludian MS6 5 Earthquake Love waves ASTFs Source complexity |
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