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观测地壳浅层电阻率随时间变化以寻找地震信息是地电阻率方法的目的。实际工作中,在保证观测精度的前提下,发现正常(无震)情况的地电阻率仍然存在着复杂的变化,给定量和定性分析地震异常带来相当大的困难。 本文分析了一些台站正常地电阻率的变化规律,并在此基础上提出“变化电性剖面模式”,来阐明一些台站正常地电阻率变化的复杂过程及其产生的可能原因。从此观点出发,导出以二层电性剖面为特征的台站正常地电阻率相对似年变化幅度公式。通过典型计算,提出获取平稳的正常原始资料是解决上述困难问题的方向,并指出了获取平稳正常变化资料的具体途径。
Observing the shallow crustal resistivity over time to look for seismic information is the purpose of the earth resistivity method. In practice, under the premise of ensuring the observation accuracy, it is found that there is still a complex change in the earth resistivity of the normal (no-shock) condition, which brings considerable difficulties for quantitative and qualitative analysis of the seismic anomalies. In this paper, the regular variation of resistivity of some stations is analyzed, and based on this, a “changing electrical profile mode” is proposed to illustrate the complicated process of normal resistivity changes of some stations and their possible causes. From this point of view, the formula of relative amplitude of normal resistivity of stations with the second-layer electrical profile is derived. Through the typical calculation, it is proposed that the steady and normal original data should be taken to solve the above difficulties, and the specific ways of obtaining stable and normal data should be pointed out.