赣北地区构造应力场分析

采用双差定位方法对赣北地区2008年1月—2019年7月545个地震进行重新定位，重定位地震在九江、宜春和新余等地区分布更为集中。结合地震精定位结果，利用格点尝试法分区计算赣北地区小震综合断层面解。结果表明，九江及周边地区最大主应力轴为近东西向，最小主应力轴为近南北向，这与其他学者的研究结果基本一致，认为该地区构造应力场特征需要更多的研究来进一步细化分析。宜春及周边地区最大主应力轴为近东西向，最小主应力轴为北北东向，应力类型为逆断型。 

The analysis of stress field in northern Jiangxi Province

We relocated 545 earthquakes that occurred in northern Jiangxi Province,from January 2008 to July 2019,using the double-difference location algorithm to improve relative location accuracy.Compared with the initial locations,the results of precise relocation in Jiujiang,Yichun and Xinyu areas are more concentrated.According to the precise relocation results,composite fault plane solution was calculated with the grid point test method.The result shows that the direction of maximum principal stress of Jiujiang and adjacent areas is nearly EW and that of the minimum principal stress is nearly NS,which is basically consistent with the previous research results.It is considered that the more research is needed to further refine and analyze characteristics of tectonic stress field in Jiujiang area.In Yichun and adjacent areas,the direction of maximum principal stress is nearly EW and that of the minimum principal stress is NNE and the area is in a thrust stress regime.