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RELOCATION OF THE MODERATE AND SMALL EARTHQUAKE IN JILIN AREA AND QIAN'AN-QIANGUO 5.0 EARTHQUAKE SEQUENCE USING THE DOUBLE DIFFERENCE LOCATION ALGORITHM

Wen Yan,Wen Hongtao,Zhang Chenxia(Earthquake Administration of Jilin Province,Jilin Changchun 130022,China)  
In this paper,we relocate 317 moderate and small earthquakes in Jilin area using the double difference location algorithm.265 earthquakes location result is obtained,which shows epicenter distribution pattern has less variation,but earthquake located in partial area have tendency to tectonic zone and its inter cross area.Earthquake cluster distribute more focusing.Focus depth distributes from 0 to 25 km mainly.The result of after-shock of Qianan-Qianguo 5.0 earthquake located by using double difference location algorithm shows earthquake more focus to hypocenter.The direction appears North to East and depth is about 10km.The research result shows the location accuracy by the method is better and improves more than original location result in residual error,evaluated error,epicenter distribution and focal depth.
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