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《Earthquake Research in China》 2007-02
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Discussion on Precise Relocation and Seismo-tectonics of the Jiujiang-Ruichang Earthquake

Lü Jian 1,2) Ni Sidao 1) Shen Xiaoqi 3) Gao Jianhua 2) Zeng Xinfu 2) 1)University of Science and Technology of China, Hefei 230026,China2)Earthquake Administration of Jiangxi Province,Nanchang 330039,China3)Earthquake Administration of Anhui Province, Hefei 230026,China  
Based on relocating the Jiujiang-Ruichang earthquake sequence which occurred on 26 November, 2005 in Jiangxi Province with double-difference (DD) algorithm and master event technique, discuss focal mechanism of the main shock (M_S5.7) and the probable seismo-tectonics. The precise relocation results indicate that the average horizontal error is 0.31km in an EW direction and 0.40km in an NS direction, the average depth error is 0.48km. The focal depths vary from 8km to 14km, and with predominant distribution in 10~12km. The epicenter of the main shock is relocated to be 29.69°N,115.74°E and the focal depth is about 10.8km. Combining the predominant distribution of earthquake sequence, the focal mechanism of the main shock and the tectonics condition of NE,NW faults growth in seismic region, we infer that the main shock of earthquake sequence is caused by an NW striking buried fault in the Ruichang basin, The nature of seismic faults needed to be further explored.
【Fund】: 地震科学基金(A07124);; 中国地震局“数字地震资料在短临跟踪中的应用”项目(120602-06-114)
【CateGory Index】: P315
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