新疆于田M_S 7.3地震前重力场变化的质源体特征  

Estimate the characteristic of density anomaly source of gravity variation before Ms 7.3 earthquake, Yutian, Xinjiang

作　　者：陈石[1] 祝意青[2] 蒋长胜[1] 徐伟民[1] 卢红艳[1] 郭凤义[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]中国地震局第二监测中心,中国西安710054

出　　处：《地震地磁观测与研究》2011年第5期1-8,共8页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地球物理研究所基本科研业务专项(DQJB09A02;DQJB11C14)

摘　　要：应用中国地壳运动观测网络工程获得的1998～2005年4期重力场变化观测资料,结合EGM2008的重力场模型作为区域背景场。对2008年新疆于田M_S7.3地震前的重力场变化特征进行深入分析,通过位场延拓和空间求导等方法,对震前的质源体边界特征进行跟踪和估定。同时,尝试利用一种应用空间相关性加权分析方法给出地震危险性空间概率性分布估计。his paper based on the gravity variation dataset from the Project of China Crust Movement Measuring Network between 1998 2005, and combined with the gravity field model of EGM 2008 as the regional background field. Research for the features of gravity filed variation before MsT. 3 earthquake, Yutian, Xinjiang, according to the seismogenic model, using the potential field continuation and spatial derivation methods, try to estimate the boundary of density anomaly source before earthquake. Meanwhile, in this paper, we proposal a spatial weighted correlation analysis method for obtain probability estimates on earthquake in hazard zone.

关 键 词：震质源 空间相关 位场延拓 质源体边界 孕震模型 

分 类 号：P315.726[天文地球—地震学]