新疆于田Ms7.3地震前重力场变化的质源体特征

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Ms7.3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 Ms 7. 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.