摘要
银川望洪电阻率三测向整体存在“夏高冬低”的“反向年变”,年变幅度约为1%,通过相关分析和多元线性回归分析确定主要影响因素,结合影响系数理论和地电阻率年变化数值模拟,尝试对各影响因素物理机理进行分析。结果表明:银川望洪电阻率“夏高冬低”的年变形态主要由地表薄层介质电阻率季节变化引起,受温度和水位的影响较大,受气压影响不明显,且与台址区地下电性结构密切相关。
All three component observations of the geoelectric resistivity at Wanghong in Yinchuan have a reverse annual variation characteristic of high values in summer and low values in winter.The annual variation range is about 1%.In order to study the influence factors and physical mechanisms of the annual variation of resistivity observations in Wanghong,the main influence factors were determined through correlation analysis and multiple linear regression,and then combined with the influence coefficient theory and the numerical simulation of the annual variation of the geoelectric resistivity observations,the physical mechanisms for each influence factor were analyzed.The results show that the annual variation of the resistivity in Wanghong is mainly caused by the seasonal change of the resistivity of the thin layer of the earth surface,which is greatly affected by temperature and water level;the influence of air pressure is not obvious.It is also closely related to the underground electrical structure of the site area.
作者
张文鑫
张慧
马楠
卫定军
ZHANG Wenxin;ZHANG Hui;MA Nan;WEI Dinjun(Earthquake Agency of Ningxia Hui Autonomous Region,Yinchuan 750001,China)
出处
《地震地磁观测与研究》
2022年第5期71-78,共8页
Seismological and Geomagnetic Observation and Research
基金
宁夏地震科研基金(项目编号:NX202007)。
关键词
地电阻率
反向年变
影响系数
薄层效应
ground resistivity
reverse annual variation
coefficient of influence
thin layer effect
