九江-瑞昌5.7级地震余震震源机制解
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摘要
基于层状介质中的点源位错模型,利用流动台网记录,反演得到了九江-瑞昌5.7级地震的112个ML≥1.5余震的震源机制解,对震源机制解结果的分析表明:1)九江-瑞昌5.7级地震的余震破裂走向的优势分布为NNW和NEE,倾角50～60°,滑动角-60～-100°;2)震源区应力场的主压应力轴方位呈近EW方向分布,主张应力轴方位近NS向,与江西北部构造应力场特征基本一致。
With the point source dislocation model in layered medium and using the records of mobile seismic network,we calculated the focal mechanism solutions of 112 ML≥1.5 aftershocks of the Jiujiang-Ruichang earthquake.By analyzing the results,the conclusions are obtained:1) The predominant rupture strikes of the Jiujiang-Ruichang earthquake aftershocks are NNW and NEE,its predominant dip angle is between 50 and 60°,and its predominant slip angle is between-60 and-100°;2)The pressure axis of epicentre stress field is distributed in the near diretion of EW,and its tensile axis is distributed in the near diretion of NS.The predominant orientation of these solutions is close to the character of tectonic stress field in north Jiangxi.
With the point source dislocation model in layered medium and using the records of mobile seismic network,we calculated the focal mechanism solutions of 112 ML≥1.5 aftershocks of the Jiujiang-Ruichang earthquake.By analyzing the results,the conclusions are obtained:1) The predominant rupture strikes of the Jiujiang-Ruichang earthquake aftershocks are NNW and NEE,its predominant dip angle is between 50 and 60°,and its predominant slip angle is between-60 and-100°;2)The pressure axis of epicentre stress field is distributed in the near diretion of EW,and its tensile axis is distributed in the near diretion of NS.The predominant orientation of these solutions is close to the character of tectonic stress field in north Jiangxi.
引文
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7吕坚,等.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.地球物理学报,2008,51(1):159-165.
8李峰,翟杰,罗俊秋.九江-瑞昌地震序列震源机制解探讨[J].大地测量与地球动力学,2006,26,(增刊):123-126.
2林纪曾,等.粤东、闽南沿海小震震源参数的研究[J].地震学报,1991,13(4):420-429.
3胡新亮,等.利用数字地震记录的P,S波振幅比资料测定小震震源机制解的可靠性分析[J].地震地质,2004,26(2):347-354.
4王椿镛,等.大别造山带上部地壳结构的有限差分层析成像[J].地球物理学报,1997,40(4):495-502.
5王椿镛,等.大别造山带地壳结构研究[J].中国科学(D辑),1997,27(3):221-226.
6吕坚,等.九江-瑞昌地震的精确定位及其发震构造初探[J].中国地震,2007,23(2):166-174.
7吕坚,等.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.地球物理学报,2008,51(1):159-165.
8李峰,翟杰,罗俊秋.九江-瑞昌地震序列震源机制解探讨[J].大地测量与地球动力学,2006,26,(增刊):123-126.
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