摘要
近年来延庆台地电阻率观测多次出现因环境干扰而引起的较为显著的异常变化,尤其是观测环境中铁质干扰源对地电阻率观测的幅度和形态的影响.本文依据台站测区地下高密度电性结构剖面和电测深结果建立了三维数值模型,分析了几种铁质对延庆台地电阻率观测的影响幅度和形态,结果表明,在扣除地电阻率基准值后,干扰幅度和形态与实际观测值的异常变化较吻合,从而从数值分析的角度确定了地下铁质对延庆地电阻率观测的干扰.
In recent years,resistivity observation in Yanqing station appeared with more than once remarkable anomalies caused by environmental interference,especially the iron interference on disturbance amplitude and pattern.According to underground high density electric structure profile and electrical sounding of Yanqing station,we established a three-dimensional numerical model to analyze the influence from several iron media on the amplitude and the pattern of the earth resistivity.The results showed that after deducted the reference value of earth resistivity,the disturbance amplitude and pattern tallied with the actual observed anomalies,which verified that the iron medium has interference on earth resistivity observation from the perspective of numerical analysis.
出处
《地震学报》
CSCD
北大核心
2017年第4期520-530,共11页
Acta Seismologica Sinica
基金
地震科技星火计划(XH14001SX)
中国地震局震情跟踪课题(2017020101)联合资助
关键词
地电阻率
铁质干扰
三维数值模拟
观测环境
异常变化
earth resistivity
iron interference
three-dimensional numerical simulation
observation environment
anomalous change
