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.
2022,43（5）: 71-78 收稿日期：2022-04-07
DOI：10.3969/j.issn.1003-3246.2022.05.009
基金项目：宁夏地震科研基金（项目编号：NX202007）
作者简介：张文鑫(1992-),男,助理工程师,主要从事数字地震资料分析等研究工作。E-mail:1726421027@qq.com
参考文献：
方炜,张国强. 地电阻率年变化特征及机理解释[J]. 国际地震动态,2019,(8):9.
金安忠. 地电阻率正常变化与电剖面的关系[J]. 地震学报,1981,3(4):421-428.
雷启云. 青藏高原东北缘弧形构造带的扩展与华北西缘银川盆地的演化[D]. 北京:中国地震局地质研究所,2016.
毛先进,李志祥,杨玲英. 台址下表层介质电阻率变化对视电阻率观测值影响特征的初步研究[J]. 地震研究,2003,26(4):338-342.
钱家栋,陈有发,金安忠. 地电阻率法在地震预报中的应用[M]. 北京:地震出版社,1985.
钱家栋,赵和云. 地电阻率的数值模拟和多极距观测系统[J]. 地震学报,1988,10(1):77-89.
钱家栋. 地震电磁学理论基础与观测技术(试用本)[M]. 北京:地震出版社,2010:93-105.
饶文,刘海洋,张治广,等.柯坪地电阻率台年变特征及成因分析[J]. 地震地磁观测与研究,2021,42(1):61-68.
沈红会,叶碧文,孙春仙,等. 地电阻率与水位关系的机理分析[J]. 地震,2020,40(4):183-190.
田山,郑文俊,关华平,等. 地电阻率年变化与气象因素及水位的关系[J]. 地震,2000,20(4):45-49.
解滔,卢军. 地电阻率三维影响系数及其应用[J]. 地震地质,2015,37(4):1 125-1 135.
解滔,卢军.含裂隙介质中的视电阻率各向异性变化[J]. 地球物理学报,2020,63(4):1 675-1 694.
杨明芝,张文孝,赵和云. 关于层状介质视电阻率响应系数的研究[J]. 西北地震学报,1986,6(2):27-38.
张国苓,乔子云,贾立峰,等. 河北昌黎地电阻率频谱特征分析[J]. 地震地磁观测与研究,2016,37(1):57-62.
赵和云,张文孝. 银川台地电阻率趋势变化及年变的分析[J]. 地震,1985,5(1):32-38.
赵和云,钱家栋. 地电阻率观测中的地表薄层影响与数学模拟[J]. 地震,1986,6(5):37-41.
周佃刚. 贺兰山-银川盆地上地壳电性结构研究[D]. 成都:成都理工大学,2014.
Lu J, Xue S Z, Qian F Y, et al. Unexpected changes in resistivity monitoring for earthquakes of the Longmen Shan in Sichuan, China, with a fixed Schlumberger sounding array[J]. Physics of the Earth and Planetary Interiors, 2004, 145(1/4):87-97.
Park S K, Van G P. Inversion of pole-pole data for 3-D resistivity structure beneath arrays of electrodes[J]. Geophysics, 1991, 56(7):951-960.
