摘要
本文利用双差定位法对发生在吉林区域317次中小地震进行重新定位,得到265次地震定位结果,显示震中分布总体格局变化不大,但局部地区地震有向构造带及其交汇处集中的变化,震群分布更加集中,震源深度主要集中在0～25km。对乾安—前郭M5.0级地震余震序列双差定位,结果显示地震更加集中于极震区,方向呈北偏东,深度分布在10KM左右。研究结果初步表明该方法定位精度比较高,无论在残差、测定误差、震中分布还是震源深度方面,都比原来定位结果有较大改进。
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 lOkm. 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.
出处
《东北地震研究》
2007年第1期2-7,共6页
Seismological Research of Northeast China
关键词
双差定位法
地震定位
余震序列
double difference location method
earthquake location
after-shock sequence
