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本文从理论和实际观测资料方面讨论了我国某些地电阻率台站出现的冬天低值、夏天高值的反常年变化,指出出现这类年变化的原因可能有三种,其中最主要的是在特殊地电断面上,由于表层介质电性变化对地电阻率测量以反向贡献所致,这是表层电阻率变动引起地下电流密度非线性变化在特殊地电断面上的反映。这种特殊地电断面的标志就是表层介质的响应系数出现负值。此外,本文还讨论了在资料处理时,这类年变的消除方法。
This paper discusses the winter low and summer high values of some earth resistivity stations in our country from the theoretical and practical observation data, and points out that there may be three reasons for such changes in the year, the most important of which are In the special geoelectric section, the ground resistivity measurement is inversely contributed to by the electrical change of the surface dielectric. This is a reflection of the non-linear variation of the underground current density in the special geoelectric section due to the change of the surface resistivity. The sign of this special geoelectric section is that the surface media response coefficient is negative. In addition, this article also discusses the methods used to eliminate such annual variations in data processing.