2009年青海大柴旦6.4级地震序列的双差法重新定位研究  

RELOCATION OF DACHAIDAN Ms6.4 EARTHQUAKE SEQUENCE IN QINGHAI PROVINCE IN 2009 USING THE DOUBLE DIFFERENCE LOCATION METHOD

作　　者：刘文邦[1] 王培玲[1] 马玉虎[1] 陈玉华[1] 

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《高原地震》2011年第1期24-26,共3页Plateau Earthquake Research

基　　金：2010年度震情跟踪合同制定向工作任务(2010020201);青海省地震局地震科学基金(2009A01)资助

摘　　要：采用双差地震定位算法对2009年青海大柴旦6.4级地震和3个及以上台站记录到的余震进行了重新定位,获得了873次地震的重新定位结果。主震的震中位置为37.56°N,95.90°E,震源深度6.5 km,发震在大柴旦宗务隆山断裂带。精确定位结果与原始数据进行比较,定位残差明显减小,定位后的地震分布更加集中,主要分布在大柴旦宗务隆山断裂带周围,震源深度优势分布在2～11 km,与主震震中位置和震源深度相符。In the paper,the double-difference earthquake location method is used to relocate Dachaidan Ms6.4 earthquake in 2009 and all the aftershocks that recorded by three or more stations.873 earthquake relocation results are obtained.Main shock epicenter is roughly at 37.56° N,95.90° E at Dachaidan-Zongwulong fault,the depth of the source is about 6.5 km.Comparing the precise positioning results and the original data,it is found that the location residuals significantly reduced,and the distribution of the relocated earthquakes become more concentrated,mainly located around Dachaidan-Zongwulong fault zone,advantage of the focal depth distribution in the 2~11 km,this is consistent with the epicenter location and focal depth of the main shock.

关 键 词：大柴旦6.4级地震 余震序列 双差定位方法 青海 

分 类 号：P315.32[天文地球—地震学]