| 2005年11月26日九江—瑞昌Ms5.7、Ms4.8地震的震源机制解与发震构造研究 |
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| 引用本文： | 吕坚,郑勇,倪四道,高建华.2005年11月26日九江—瑞昌Ms5.7、Ms4.8地震的震源机制解与发震构造研究[J].地球物理学报,2008,51(1):158-164. |
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| 作者姓名： | 吕坚 郑勇 倪四道 高建华 |
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| 作者单位： | 1.中国科学技术大学，合肥 230026;2.江西省地震局，南昌 330039;3.中国地震局地球物理研究所，北京 100081 |
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| 基金项目： | 地震科学联合基金，国家自然科学基金，地震科学联合基金，中国地震局"数字地震资料在短临跟踪中的应用"项目 |
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| 摘 要： | 利用来源于江西区域台网和中国地震台网共6个台的宽频带数字地震记录，采用CAP方法反演了2005年11月26日九江—瑞昌5.7级地震和4.8级强余震的震源机制解，并结合地震序列的精确定位结果和区域地质背景讨论了发震构造.结果显示，5.7级主震的最佳双力偶解为节面Ⅰ走向223°，倾角75°，滑动角144°；节面Ⅱ走向324°，倾角55°，滑动角18°.4.8级强余震的最佳双力偶解为节面Ⅰ走向54°，倾角71°，滑动角-160°；节面Ⅱ走向317°，倾角71°，滑动角-20°，这两次地震的震源机制解不完全一致.地震序列在震中空间分布和震源深度分布上也具有复杂性.5.7级主震发生后，余震活动从SE向NW、从浅部往深部发展，在破裂过程中可能遇到障碍体，触发了4.8级强余震.5.7级主震的发震构造可能为隐伏在瑞昌盆地内的洋鸡山—武山—通江岭NW向断裂，4.8级强余震的发震构造可能为瑞昌盆地西北缘的丁家山—桂林桥—武宁NE向断裂北段.
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| 关 键 词： | 九江—瑞昌地震 震源机制解 地震构造 CAP方法 |
| 文章编号： | 0001-5733（2008）01-0158-07 |
| 收稿时间： | 2007-06-05 |
| 修稿时间： | 2007-10-08 |
Focal mechanisms and seismogenic structures of the Ms5.7 and Ms4.8 Jiujiang—Ruichang earthquakes of Nov. 26, 2005 |
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| L Jian,ZHENG Yong,NI Si-Dao,GAO Jian-Hua.Focal mechanisms and seismogenic structures of the Ms5.7 and Ms4.8 Jiujiang—Ruichang earthquakes of Nov. 26, 2005[J].Chinese Journal of Geophysics,2008,51(1):158-164. |
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| Authors: | L Jian ZHENG Yong NI Si-Dao GAO Jian-Hua |
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| Institution: | 1.University of Science and Technology of China, Hefei 230026,China;2.Earthquake Administration of Jiangxi Province,Nanchang 330039,China;3.Institute of Geophysics, Chinese Earthquake Adimistration, Beijing 100081,Chin;a |
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| Abstract: | Based on the records of 6 stations in Jiangxi regional seismic network and CSN, we obtained the focal mechanisms of the Ms5.7 Jiujiang Ruichang earthquake and its Ms4.8 aftershock of Nov.26, 2005 with the “Cut and aste"(CAP) method, and analyzed the seismogenic structure combining with relocation of the aftershock sequence and the geologic settings in the region. Our result shows that the best double couple solution of the Ms5.7 event is 324°,55°and 18° for strike, dip and rake angles respectively, the other nodal plane is 223°,75° and 144°；for the Ms4.8 aftershock the solution is 54°, 71°, -160° respectively with the other nodal plane of 317°, 71° and -20°. Complexities can be found from aftershock distribution and source depth of the sequence. After the occurrence of the Ms5.7 main shock, aftershocks occurred and propagated from SE to NW and from shallower to deeper crust, then they probably encountered an asperity and triggered the Ms4.8 strong aftershock. This complexity and the different focal mechanisms imply that the two earthquakes may not occur on the same fault, we infer that the Ms5.7 main shock is caused by the NW striking Yangjishan-Wushan-Tongjiangling fault buried in Ruichang basin and the Ms4.8 aftershock occurred on the NE striking Dingjiashan-Guilinqiao-Wuning fault in the northwest margin of the basin. |
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| Keywords: | Jiujiang-Ruichang earthquake Focal mechanism Seismogenic structure CAP method |
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