Discussion on the Precise Relocation and Seismo-Tectonics of the Jiujiang-Ruichang Earthquake |
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| Authors: | Ni Sidao Shen Xiaoqi Gao Jianhua Zeng Xinfu |
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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]Earthquake Administration of Anhui Province, Hefei 230026, China |
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| Abstract: | Based on relocating the Jiujiang-Ruichang earthquake sequence which occurred on November 26, 2005 in Jiangxi Province with the double-difference (DD) algorithm and master event technique, the paper discusses the focal mechanism of the main shock (Ms5.7) and the probable seismo-tectonics. The precise relocation results indicate that the average horizontal error is 0.31 km in a EW direction and 0.40km in a NS direction, and the average depth error is 0.48km. The focal depths vary from 8kin to 14km, with the predominant distribution at 10km～ 12km. The epicenter of the main shock is relocated to be 29.69° N, 115.74°E and the focal depth is about 10.Skm. Combining the predominant distribution of the earthquake sequence, the focal mechanism of the main shock and the tectonic conditions of NE- and NWstrike faults growth in the seismic region, we infer that the main shock of the earthquake sequence was caused by a NW striking buried fault in the Rnichang basin. The nature of seismic faults needs to be further explored. |
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| Keywords: | Jiujiang-Ruichang earthquake Double-difference earthquake location algorithm Master event technique Focal mechanism solution Seismo-tectonics Earthquake Precise nature of needs faults basin tectonic conditions growth seismic region focal depth epicenter distribution direction precise results average horizontal error |
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