【摘要】 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。更多还原

【Abstract】 In this paper,from theoretical calculation and practicaI observation data,we discussed a kind of yearly change which presents low vaIue in winter and high vaIue in summer at some earth resistivity stations in our country.lt is pointed out that there may be three kinds of reasons Ieading to such a yearIy change.Among them the principal one is the contrary con- tribution of resistivity variation in overIayer medium to observed apparent resistivity for some of special geoelectrical profiles,in which the variation of overlayer resistivity results in a non-linear variation of underground current density in a special geoelectrical profile.The overlayer response coefficient sishows the negtive,which is a very apparent mark for such a special geoelectrical Profile.In addition,the eliminating approach about thrs kind of yearly change is also discussed.更多还原