九江-瑞昌5.7级地震余震震源机制解  

FOCAL MECHANISM SOLUTIONS OF AFTERSHOCKS OF JIUJIANG-RUICHANG EARTHQUAKE

作　　者：曾文敬 赵爱平 汤兰荣 李传江 邹水林 

机构地区：[1]江西省地震局,南昌330039

出　　处：《大地测量与地球动力学》2009年第4期42-47,共6页Journal of Geodesy and Geodynamics

基　　金：地震科学联合基金(A07124);江西省社会发展科技攻关项目:九江-瑞昌地震破裂过程;序列特征及影响研究

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 network,we calculated the focal mechanism solutions of 112 ML≥ medium and using the records of mobile seismic 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.

关 键 词：九江-瑞昌余震序列 震源机制解 归一频数分布 震源应力场 构造应力场 

分 类 号：P315.63[天文地球—地震学]