辽宁地区时变重力场源变化特征分析

地震重力分析通过研究时变重力场变化获取地球内部介质物性变化信息.采用贝叶斯重力网平差方法对辽宁地区2011-2014年共计四年7期的流动重力观测资料进行处理,对研究区重力观测网总体监测能力做出分析,选用欧拉反褶积对研究区的重力变化场源深度及空间分布特征进行反演和解释.通过反演计算发现,在2013年灯塔Ms5.1地震前沈...

Analysis on the Characteristics of Time-varying Gravity Field Source Changes in Liaoning Area

Seismic gravity analysis can be used to obtain the physical properties of the earth by studying the change of the time-varying gravity.In this paper,the Bayesian gravity network adjustment method is used to process the mobile gravity observation data for a total of 7 periods of four years in Liaoning from 2011 to 2014,evaluate and analyze the overall monitoring capability of the gravity observation network in the study area,and employ the Euler deconvolution method to inverse field source parameters,before the lighthouse M_S5.1 earthquake occurred in 2013.The results show that the gravity in the Shenyang-Liaoyang area changed greatly,forming a high-gradient zone,reflecting the increase in seismic activity in this area;while the depth of the underground medium field source inverted by Euler deconvolution is 10~40 km,It is consistent with the actual depth of the earthquake and is concentrated near the fault zone.The research results can further provide a certain reference for studying the characteristics of the deep seismogenic environment in Liaoning.