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地震 ›› 2007, Vol. 27 ›› Issue (增刊): 28-34.

• 地电阻率研究 • 上一篇    下一篇

电极附近电阻率变化对观测值的影响特征

毛先进1, 钱家栋2, 马钦忠3   

  1. 1.云南省地震局, 云南 昆明 650224;
    2.中国地震局地震预测研究所, 北京 100036;
    3.上海市地震局, 上海 200062
  • 收稿日期:2006-06-22 修回日期:2006-07-19 出版日期:2007-06-30 发布日期:2021-10-29
  • 作者简介:毛先进(1962-), 男, 湖南常德人, 副研究员, 1997年获博士学位, 主要从事地球物理勘探研究与应用、 地震电磁前兆理论与方法等研究。
  • 基金资助:
    国家科技基础条件平台重点项目(2004DEA71000)

Influence characteristics of resistivity variation in the vicinity of poles On observed apparent resistivity

MAO Xian-jin1, QIAN Jia-dong2, MA Qin-zhong3   

  1. 1. Earthquake Administration of Yunnan Province, Kunming 650041;
    2. Institute of Earthquake Science, CEA, Beijing 100036;
    3. Earthquake Administration of Shanghai Municipality, Shanghai 200062, China
  • Received:2006-06-22 Revised:2006-07-19 Online:2007-06-30 Published:2021-10-29

摘要: 用三维边界积分方程法模拟计算研究了台址下浅层电阻率变化对观测数据的影响, 研究了观测系统各电极附近一定范围内电阻率上升或下降对视电阻率观测值的影响特征。 结果表明: ① 在电阻率发生变化的介质体积和变化率相同的条件下, 测量极附近电阻率变化大于供电极附近电阻率变化对观测视电阻率的影响; ② 各电极附近电阻率下降对观测视电阻率的影响明显大于电阻率上升的影响。 一般情况下电极附近电阻率上升对观测结果的影响可以忽略不计。

关键词: 地电阻率, 电极附近电阻率变化, 三维边界积分方程, 影响特征

Abstract: With 3-dimensional Boundary Integrate Equation (BIE), the influence characteristics of resistivity variation in the shallow part and the vicinity of poles on the observed apparent resistivity were studied in this paper. Research results show that, ① When the volume and change rate of soil in which the resistivity varied were the same, the influence on the observed apparent resistivity due to resistivity variation in the vicinity of potential poles is bigger than that in the vicinity of current poles. ② The influence due to resistivity decrease in the vicinity of every pole is clearly bigger than that of resistivity increase, generally speaking, the influence due to resistivity increase in the vicinity of poles can be neglected.

Key words: Earth resistivity, Resistivity variation in the vicinity of poles, 3-dimensional Boundary Integrate Equation, Influence characteristics

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