Hypocenter relocation in central and southern Jiangsu province and adjacent areas, China and its application to fault research
江苏中、南部及邻区地震重新定位及在断层研究中的应用

The advantage and disadvantage of Double-Difference(DD) technique and Joint Hypocentral Determination(JHD) technique to locate earthquakes are analyzed. Combining above two methods and applying the Genetic Algorithm(GA) to optimization, we relocated the hypocenters in central and southern Jiangsu province and adjacent areas(29°~34°N, 117.5°~122.5°E) in East China. Firstly, we used GA for inversion to get crustal structure of the research area, then using DD to get precise relative locations for 58% original events, and last 42% events were located by GA. The relationship between events and the faults , the correlation of focus-depth and fault of Liyang M6.0 earthquake, southern Yellow Sea M6.2 earthquake, Changshu-Taicang M5.1 earthquake are discussed, the feature of focus-depth of the Changshu-Zhangjiagang swarm is analysed.