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当前世界各国都在研究地震的各种成因,想以此为基础,通过各种测量手段来寻找地震发生之前的征兆(简称前兆),从而达到准确预报之目的。我国著名科学家李四光同志在论述结构地震成因时指出;“地震是地应力作用于岩石的直接结果,地震产生之前,地应力有个积累过程,因此研究应力变化,加强到突变过程,是解决地震预报的关键”。由于存在地应力集中过程,故在此应力集中过程之中,地壳必将发生形变,地形变将使一些物理量发生变化,电阻率的显著变化就是其中之一,李四光同志在实验的基础上指出:
At present, all countries in the world are studying various causes of earthquakes. Based on this, all kinds of earthquakes are expected to find signs before earthquakes (precursors) through various means of measurement so as to achieve accurate forecasts. Comrade Li Siguang, a famous scientist in our country, pointed out when discussing the causes of structural earthquakes. “Earthquakes are the direct result of earth stress acting on rocks. Prior to earthquakes, there is a process of accumulation of earth stress. Therefore, studying stress changes and strengthening the catastrophe process is the solution to earthquake prediction key”. Because of the stress concentration process, the crust is bound to deform during the process of stress concentration. The deformation of the earth will change some physical quantities. One of them is the significant change of resistivity. Comrade Li Siguang pointed out on the basis of experiment: