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地震 ›› 2007, Vol. 27 ›› Issue (增刊): 131-138.

• 地电场研究 • 上一篇    下一篇

天然场源对地电场观测中的贡献研究

马钦忠1, 席继楼2, 蔡晋安2, 汪育新1   

  1. 1.上海市地震局, 上海 200062;
    2.中国地震局地震预测研究所, 北京 100036
  • 收稿日期:2006-06-05 修回日期:2006-07-01 出版日期:2007-06-30 发布日期:2021-10-29
  • 作者简介:马钦忠(1959-), 男, 河南洛阳人, 研究员, 2000年获博士学位, 主要从事地球电磁学、 地震预报等研究。
  • 基金资助:
    国家科技基础条件平台重点项目(2004DEA71000)

Study on contribution of natural source to the geoelectrical field observataion

MA Qin-zhong1, XI Ji-lou2, CAI Jin′an2, WANG Yu-xin1   

  1. 1. Earthquake Administration of Shanghai Municipality, Shanghai 200062;
    2. Institute of Earthquake Science, CEA, Beijing 100036, Chian
  • Received:2006-06-05 Revised:2006-07-01 Online:2007-06-30 Published:2021-10-29

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摘要： 通过对半无限空间结构、 二层地下电性结构、 三层地下电性结构、 半无限空间中存在非均匀体情况下的模型进行计算和分析, 结果认为, 天然场源在地表所产生的地电场幅度总是随着频率的增加而增大, 对于同一频率而言, 半无限空间的电阻率越高, 则幅度越大; 当二层介质结构中的覆盖层电阻率与半无限空间的电阻率相同的情况下, 第二层介质电阻率越高, 则幅度比半无限空间情形下的幅度越大; 若在此情况下, 第二层介质之下存在第三层高阻层介质时, 则地电场幅度比前两种情形下更大。 地下存在电性非均匀性结构时, 异常体的电阻率越大, 地表大地电场的正极化变化也就越大; 异常体的电阻率越小, 通过异常体上方的地电场值就越小。

关键词: 地电场, 天然场源, 电性结构

Abstract: Based on the calculations and analysis of numerical simulation, this study result shows that the amplitude of geoelectrical field originated from natural source (magnetosphere, ionosphere) increases with the increase of frequency. For the same frequency, the higher the resistivity is, and for the half-space geoelectrical structure, the larger the amplitude is. When the resistivity of the overburden layers in two layered medium is the same as that of the former structure, the higher the resistivity of the second layer is, the larger the amplitude is than that of the half-space geoelectrical structure. When there is the third layered medium with high resistivity under the second layer, the amplitude of the geoelectrical field is larger than that of two types of situation mentioned above. When there is an inhomogeneous body in half-space medium, the higher the resistivity of the inhomogeneous body is, the larger the positive polarization is, while the lower the resistivity is, the magnitude of the geoelectrical field is.

Key words: Geoelectrical field, Natural source, Geoelectrical structure

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