| 2014年云南鲁甸MS6.5地震序列的双差定位 |
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| 引用本文： | 王未来,吴建平,房立华,来贵娟.2014年云南鲁甸MS6.5地震序列的双差定位[J].地球物理学报,2014,57(9):3042-3051. |
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| 作者姓名： | 王未来 吴建平 房立华 来贵娟 |
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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： | 中国地震局地球物理研究所基本科研业务费专项（DQJB12C04）和地震行业科研专项（201308013）资助. |
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| 摘 要： | 本文采用双差定位方法对云南鲁甸MS6.5地震震后16天的地震序列进行重定位研究.重定位结果显示,主震位于27.11°N,103.35°E,震源深度约15 km;地震序列主要呈“L”形优势分布,分为SSE向和近EW向两支,并均呈现近垂直的震源分布特征,显示此次地震为走滑型,并存在两个不同方向的破裂面.虽然此次地震发生于NE向昭通断裂及其反冲断裂（龙树断裂、大岩洞断裂）附近,但这些断裂均为逆冲型断裂,被排除了作为发震断裂的可能性;鲁甸地震发生在呈放射性分布的多条断裂的交汇部位,SSE向破裂分支与包谷垴断裂的方向一致,近EW向破裂分支与小河断裂南端的走向一致. 鲁甸地震可能已将包谷垴断裂和小河断裂在深部贯通.
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| 关 键 词： | 鲁甸MS6.5地震 地震序列 双差定位 |
| 收稿时间： | 2014-08-31 |
Double difference location of the Ludian MS6.5 earthquake sequences in Yunnan province in 2014 |
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| WANG Wei-Lai,WU Jian-Ping,FANG Li-Hua,LAI Gui-Juan.Double difference location of the Ludian MS6.5 earthquake sequences in Yunnan province in 2014[J].Chinese Journal of Geophysics,2014,57(9):3042-3051. |
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| Authors: | WANG Wei-Lai WU Jian-Ping FANG Li-Hua LAI Gui-Juan |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | The earthquake sequences within sixteen days of the Ludian MS6.5 earthquake in Yunnan province are relocated by double difference algorithm. The relocation results show that the mainshock is located at 27.11°N, 103.35°E and the focal depth is about 15 km; the earthquake sequences are distributed dominantly "L"-shaped in the SSE and EW direction, and show nearly vertical focal depth distribution, indicating it is a strike-slip earthquake and has two rupture planes in different directions. Although the Ludian MS6.5 earthquake occurs near the NE-directed Zhaotong fault and its back thrust faults (Longshu fault and Dayandong fault), these faults are thrust faults and cannot be the seismogenic fault. This earthquake occurs in the junction region where multiple faults are distributed in radial pattern; the SSE-directed rupture branch has coincident strike with the Baogu'nao fault, while the nearly EW-directed rupture branch has coincident strike with the south part of the Xiaohe fault. The Ludian MS6.5 earthquake may have connected the Baogu'nao fault and the Xiaohe fault in depth. |
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| Keywords: | Ludian MS6 5 earthquake Earthquake sequences Double difference location |
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