| 鲁甸6.5级地震发震断层判定及其构造属性讨论 |
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| 引用本文： | 徐锡伟,江国焰,于贵华,吴熙彦,张建国,李西.鲁甸6.5级地震发震断层判定及其构造属性讨论[J].地球物理学报,2014,57(9):3060-3068. |
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| 作者姓名： | 徐锡伟 江国焰 于贵华 吴熙彦 张建国 李西 |
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| 作者单位： | 1. 中国地震局地质研究所活动构造与火山重点实验室, 北京 100029;
2. 云南省地震局, 昆明 650224 |
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| 基金项目： | 国家公益性重大专项“中国地震活动断层探察——南北地震带南段”（201108001）和国家自然科学基金重大计划课题（91214201）资助. |
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| 摘 要： | 鲁甸6.5级地震是川滇菱形块体南南东向运动在青藏高原东缘与华南地块相互作用边界变形带上发生的一次中等强度地震.尽管野外应急科学考察没有发现明显的地震地表破裂带，但云南昭通防震减灾局局域地震台网记录到的余震条带状分布、震后科学考察获得的地震烈度长轴方位和极震区地震裂缝等显示出发震断层为NW向包谷垴-小河断裂，左旋走滑性质，属大凉山断裂南端部组成部分；库仑应力计算表明，鲁甸地震可对周边活动断层系历史地震空段产生应力加载作用，其地震危险性不容忽视.
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| 关 键 词： | 鲁甸地震 地震断层 地震地表破裂带 静态库仑应力 青藏高原 |
| 收稿时间： | 2014-08-31 |
Discussion on seismogenic fault of the Ludian MS6.5 earthquake and its tectonic attribution |
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| XU Xi-Wei,JIANG Guo-Yan,YU Gui-Hua,WU Xi-Yan,ZHANG Jian-Guo,LI Xi.Discussion on seismogenic fault of the Ludian MS6.5 earthquake and its tectonic attribution[J].Chinese Journal of Geophysics,2014,57(9):3060-3068. |
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| Authors: | XU Xi-Wei JIANG Guo-Yan YU Gui-Hua WU Xi-Yan ZHANG Jian-Guo LI Xi |
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| Institution: | 1. Key Lab of Active Tectonics & Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Yunnan Earthquake Administration, Kunming 650224, China |
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| Abstract: | The Ludian 6.5 earthquake occurred in the marginal zone between the eastern Tibetan Plateau and the Yangtze Craton owing to southeastward motion of the Sichuan-Yunnan rhombic block. Although no surface rupture zone was observed during the emergency scientific investigation in the epicenter, the spatial linear distribution of the aftershocks recorded by a local seismic network, with the dominated axial azimuth of the earthquake intensities and earthquake ground fissures, displays that the seismogenic fault of the Ludian earthquake is a NW-trending left-lateral strike-slip fault, named as the Baogunao-Xiaohe fault, which may belong to the southern termination of the Daliangshan fault. Coulomb stress calculation shows that the occurrence of this earthquake uploads the adjacent active fault systems and the seismic risk for the historical seismic gaps could not be ignored. |
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| Keywords: | Ludian earthquake Seismogenic fault Earthquake surface rupture zone Static Coulomb stress Qinghai-Tibetan Plateau |
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