Analysis on Double-difference Earthquake Location and the Seismicity Pattern of the Yangjiang Earthquake Sequences
Analysis on Double-difference Earthquake Location and the Seismicity Pattern of the Yangjiang Earthquake Sequences作者机构:Earthquake Administration of Guangdong ProvinceGuangzhou 510070China
出 版 物:《Earthquake Research in China》 (中国地震研究(英文版))
年 卷 期:2008年第22卷第1期
页 面:73-81页
学科分类:070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
主 题:Double-difference earthquake location algorithm Location image Rupturecharacteristic Yangjiang earthquake sequences
摘 要:The locations of about 400 earthquakes in Yangjiang, Guangdong Province are determined using the double, difference earthquake location algorithm (DDA). The seismicity pattern becomes concentrated from discrete grids. The rupture characteristics of the Yangjiang earthquake sequence show a conjugated distribution in NW and NE directions. The major distribution trends NE and dips NE with an angle of 30^o and a length of 30km,and the minor distribution trends NW and dips SE with an angle of 30^o and a length of 20km. The focal depth is 5km - 15km. The distribution of the Enping earthquake sequence,which is not far from Yangjiang,is NW-trending. The relationship between hypocenter distribution and geological structure is discussed.