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本文从水平层状介质的电法理论出发,定义了电性层的响应系数S_i,并指出:S_i代表各层电阻率的变化对△ρs/ρs贡献的“权”,同时还给出了二层、三层和深埋电极时S_i的计算公式和部分计算结果,着重讨论了电性结构对表层响应系数S_1和底层响应系数S_n的影响。最后以此理论讨论了九个地电台站的具体情况。根据理论和实际资料的分析,得出以下几点结论: 1)从电性上,台址最佳观测条件是:表层响应系数S_1=0;底层响应系数S_n=1。2)台址的表层电阻率ρ_1高一些,底层电阻率ρ_3低一点,比较接近最佳观测条件。但各层电阻率之间的搭配关系需有一定范围,过高或过低的值都会偏离最佳观测条件。3)仅仅以电性剖面类型区分台址电性条件的优劣是不完善的,最好通过具体计算S_1来评判。
In this paper, we start with the electrical theory of horizontal layered media and define the response coefficient S_i of the electrical layer. It is pointed out that S_i represents the “right” of the contribution of the resistivity of each layer to △ ρs / ρs, Layer, three layers and deep electrode S_i calculation formula and part of the calculation results, focusing on the electrical structure of the surface response coefficient S_1 and the underlying response factor S_n impact. Finally, this theory discusses the specific conditions of nine earth stations. According to the analysis of theoretical and practical data, the following conclusions are drawn: 1) The best observation conditions from the electrical and station sites are: the surface response coefficient S_1 = 0; the bottom response coefficient S_n = 1.2) Higher resistivity ρ_1, lower resistivity ρ_3 lower, closer to the best observation conditions. However, the resistivity of the various layers with the relationship between the need for a certain range, too high or too low value will deviate from the best observation conditions. 3) It is imperfect to differentiate the electrical properties of the site simply by the type of electrical profile, which is best judged by the concrete calculation of S_1.