新沂地震台地电阻率反向年变分析  

Reverse annual variation of georesistivity at Xinyi seismic station,Jiangsu Province

作　　者：解滔[1] 李飞[2] 沈红会[2] 卢军[1] 

机构地区：[1]中国地震台网中心,中国北京100045 [2]江苏省地震局,中国南京210014

出　　处：《地震学报》2013年第6期856-864,共9页Acta Seismologica Sinica

基　　金：国家科技支撑计划专题(2012BAK19B02-03);中国地震台网中心青年基金(1212)共同资助

摘　　要：结合新沂地震台电测深曲线、测区地质剖面资料,建立了三维非均匀层状介质有限元模型.以第一层介质电阻率变化模拟表层介质电阻率随季节性降雨的变化,在模型中计算了3个测道的地电阻率年变化形态.计算结果表明,EW和N45°E测道地电阻率随表层介质电阻率的增减同向增减,而NS测道地电阻率则与表层介质电阻率变化相反.该结果符合新沂台3个测道实际观测的年变形态.Combined with geologic section and electric sounding data, a three- dimensional inhomogeneous finite element model was constructed to analyze an- nual variation of georesistivity at Xinyi seismic station. Resistivity variation of shallow layer, which was caused by seasonal rainfalls, was substituted with re- sistivity changes of the first layer in the finite element model. Annual variation of georesistivity in NS, EW and N45~E channels are calculated based on the model. Analyzed results of the model suggest that georesistivity in EW and N45~E direction increases/decreases with resistivity of the first layer increasing/ decreasing, while georesistivity in NS direction varies in an reverse way. The model results accord with observations in the three monitoring directions at the Xinyi station.

关 键 词：新沂台 地电阻率 年变 有限元 

分 类 号：P315.722[天文地球—地震学]