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河北兴济台地电阻率年变特征分析
贾立峰1) 张国苓1) 乔子云1) 石富强2) 郭学增1)
1)河北省地震局,石家庄市槐中路262号 050021;2)陕西省地震局,西安 710068
摘要:
基于电测深曲线反演结果,利用地电阻率转换函数的递推公式定量模拟分析了地下水位对兴济台地电阻率的影响。结果表明,地下水位下降会造成地电阻率上升,这与兴济台N30°E向的地电阻率观测结果相符;N60°W向的地电阻率的趋势变化与N30°E向的相反,且年变幅较大,这是由于测区供电极和测量极之间存在因取土而积水成坑这个局部异常体引起的。
关键词:  地电阻率  兴济台  年变  地下水位  转换函数  数值模拟
DOI:
分类号:
基金项目:国家自然科学基金(41274079)和中国地震局震情跟踪定向工作任务青年课题(2015010403)共同资助
Annual variation characteristics of georesistivity at Xingji Seismic Station,Hebei Province
Jia Lifeng1) Zhang Guoling1) Qiao Ziyun1) Shi Fuqiang2) Guo Xuezeng1)
1)Earthquake Administration of Hebei Province,Shijiazhuang 050021,China;2)Earthquake Administration of Shaanxi Province,Xi′an 710068,China
Abstract:
Based on the electrical sounding of Xingji Seismic Station,we used the transform function recursive formula to analyze the resistivity variation caused by the ground water level. The result of the model suggests that the ascent of the ground water level can cause georesistivity to rise,which is consistent with the georesistivity observation in N30°E direction at Xingji Seismic Station,but the geosistivity change in N60°W is opposite to that of N30°E and the amplitude of the annual variation of N60°W is bigger than that of N30°E. That was caused by an excavation pit between the electrode N and the power supply electrode B.
Key words:  Georesistivity  Xingji Seismic Station  Annual variation  Ground water leval  Conversion function  Numerical simulation