【摘要】 为研究龙门山断裂带附近地区的地震波衰减特征,通过双差定位法对龙门山断裂带653个地震重新进行了精确定位。结果表明:重新定位后震中经纬度和震源深度的精度均得到改善,没有了震源深度为0的地震,最小震源深度为0.8 km,10~20 km深度存在明显的发震层;重新定位后震源的测定误差在E-W方向平均为1.49 km,在N-S方向平均为1.41 km,在垂直方向平均为1.91 km。可见双差定位法的定位精度较高,研究成果可用于计算龙门山断裂带附近地区地震记录的震源距离和获取SH分量。更多还原

【Abstract】 In order to study seismic wave attenuation characteristics nearby Longmenshan fault zone,the double difference earthquake location method was used to accurately relocate 653 earthquakes in the Longmenshan fault zone. The results show that accuracy of epicenter and focal depth have been improved,and there is no earthquake with a focal depth of 0. The minimum focal depth is 0. 8 km,and there is an obvious seismogenic layer in the depth of 10 ~ 20 km. The average error of earthquake relocation is 1. 49 km in the east-west direction,1. 41 km in the north-south direction,and 1. 91 km in vertical direction. It is concluded that double difference earthquake location method has high relocation accuracy,and the research results will be used to calculate the source distance and obtain shear horizontal waves of these earthquakes’ records.更多还原