青海兴海地区的地震精定位研究  

ACCURATE LOCATION OF EARTHQUAKES IN XINGHAI REGION IN QINGHAI PROVINCE

作　　者：黄浩[1] 胡玉[1] 谢华宏[1] 

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《高原地震》2016年第1期25-30,共6页Plateau Earthquake Research

基　　金：青海省地震科学基金项目资助(项目编号:2015B04)

摘　　要：采用青海省数字地震台网产出的观测报告,利用双差定位方法对兴海地区2008年以来的中小地震进行了精定位。结果表明,精定位后的丛集地震更加集中,并显示出北东或北北西向的优势分布。丛集地震的展布特征与断裂构造存在较好的联系,1区的地震与哇洪山—温泉断裂及其次生断裂有关,2区的地震印证了重力和航磁资料联合推测的扎列里龙洼—塔秀断裂的存在,3区的地震受控于哇洪山—温泉断裂。震源深度改善了初始定位结果的分层现象,1区和3区的深度主要分布在0 km^15 km,2区的深度分布在0 km^25 km,深度分布范围的异同与所属构造的性质有关。On the basis of earthquake report provided by Qinghai digital seismic network,the authors relocated earthquakes in Xinghai region since 2008 by double-difference location. The results show that the relocated cluster earthquake concentrated obviously and had the distribution in NE or NNW directions. The cluster earthquake＇s distribution feature has relationship with fault structure. Earthquakes in No. 1 area is related to Wahongshan-Wenquan fault and its secondary fault,the No. 2 area corroborates the existence of Zhalielilongwa-Taxiu fault speculated by gravity and aeromagnetic data,and No. 3 area is controlled by Wahongshan-Wenquan fault. Layer phenomena of focal depths have improved,depths in No. 1 and No. 3 are distributed in the range of 0 km - 15 km,and depths in No. 2 area distributes in the range of 0 km - 25 km,the difference is related to properties of faults.

关 键 词：双差定位 兴海地区 地震构造 

分 类 号：P315.5[天文地球—地震学]