摘要
利用双差定位法对发生在三峡郭家坝ML3.8地震震中附近的震群进行重新定位,得到113次地震定位结果。结果显示:地震震中集中分布于郭家坝ML3.8地震的极震区,方向呈北偏西,震源深度约7km。由上述研究结果可知,利用双差定位法定位精度比较高,特别是在减小残差、测定误差、控制震中分布及震源深度等方面,均比原来的定位结果有较大的改进。
The earthquake swarms around in Guojiaba ME3. were relocated with the double difference location method and 113 found that these earthquakes are concentrated in the meizoseismal 8 earthquake epicenter in Three Gorges region earthquakes location results were obtained. It is area. The direction appears north by west and depth is about 7 km. The research result shows the location accuracy with this method is better than that given before and many improvements have been mode in following aspects, minishing residual error, evaluating error and controlling epicenter distribution and focal depth.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第6期56-59,共4页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金重点基金(407303172011)
中国地震局地震研究所所长基金(IS200856070)
关键词
郭家坝地区
地震序列
双差定位法
重定位
极震区
Guojiaba aera
earthquake sequence
double difference location method
relocation
meizoseismal area
