重庆及邻区地震精定位及活动性分析

采用Hypo2000定位法及双差定位法,对2009 年 1 月至 2018 年 10 月重庆及邻区的地震进行精定位,对不同方法所得结果进行对比,进而研究重庆及邻区地震活动性。重定位后,走时残差基本小于0.3 s,震中在平面方向沿断裂展布形态有所收敛,震源深度主要分布在4—10 km,故该区地震多为浅源地震。荣昌、巫山地区地震活动与人类活动间有一定相关性,北碚、石柱、武隆、巫溪、綦江地区地震震中多分布在断裂附近,受地质构造控制明显。

Research on location method and seismic activity analysis in Chongqing and its adjacent areas

The Hypo2000 method and the HypoDD method are used to precisely locate the earthquakes in Chongqing and its adjacent areas from January 2009 to October 2018. The results obtained by different methods were compared to study the seismic activity of Chongqing and adjacent areas. After relocation, the residual time difference is less than 0.3 s, and the epicenter is converged along the fault distribution pattern in the plane direction. The focal depth is mainly distributed in 4-10 km, so the earthquakes in this area are mostly shallow earthquakes. Seismic activities in Rongchang and Wushan areas are related to human activities. Earthquakes in Beibei, Shizhu, Wulong, Wuxi and Qijiang areas are mostly distributed near faults which are obviously controlled by geological structures.