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Discussion on moment tensor solution and seismogenic structure of Ruichang-Yangxin earthquake on 10 September 2011 |
Lifen Zhang1, 2, Guichun Wei, Wulin Liao1 |
1 Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
2 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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Abstract Ruichang-Yangxin earthquake is another moderate earthquake in Yangxin-Jiujiang area since 2005 Jiujiang-Ruichang M5.7 earthquake. In order to more understand the seismic activities in this area, we study the moment tensor solution and the seismogenic structure of the Ruichang-Yangxin earthquake. Precise earthquake relocation shows that the mainshock occurred on the southwestern part of the NE-trending fault and aftershocks are distributed not only along the NE-trending fault but also along its conjugated NW-trending fault. By comprehensive analysis on the earthquake distribution, characteristics of isoseismal curve, focal mechanism, and regional structure characteristics, it is inferred that this earthquake is caused by the NE-trending Tanlu fault. In addition, it has close relationship with the conjugated NW-trending fault as well. Many researches have shown that the junction area is the earthquake-prone area, and should be paid more attention to. And our study also proves this viewpoint.
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Received: 13 April 2012
Published: 10 June 2012
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Fund:the Director Foundation of Institute of Seismology, China Earthquake Adminstration (IS201102643) and National Nature Science Foundation of China (No. 41004020) |
Corresponding Authors:
Lifen Zhang
E-mail: zhanglf112@163.com
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