唐山地震地电阻率震时突变及前兆标志研究

通过研究唐山７．８级地震ρｓ震时突变现象。发现ρｓ震时突变具有变化幅度显著，空间分布普遍以及与震前ρｓ异常变化性质的相反的似弹性回跳现象等。研究了与ρｓ震时突变有关的震前ρｓ的前兆标志及其特征，用从复杂的ρｓ异常变化中识别和判定与地震有直接关系的地震前兆，对提高地电方法地震水平具有重要的实际意义和应用前景。

Study on the Sudden Change of Ground Resistivity during Tangshan Earthquake and Its Precursor Mark

Through the study on the sudden change of ground resistivity during Tangshan earthquake ( M S=7 8),it has been found that the sudden change of ground resistivity during earthquake with phenomenon of the obvious rangeability and spatial distribution generalization,as well as the elastic rebound opposited to the character of anomalous change of ground resistivity before earthquake.The precursor mark and its character of the ground resistivity before earthquake has been studied.The recognitioning and judgementing for the precursor were related directly with the earthquake form the abnormal change of complex ground resistivity during the earthquake,and it is of importance to raise the level of earthquake prediction in using the method of groud resistivity and its application for the future.