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本文介绍了昌黎、武都两个地电台记录到的1976年唐山7.8级和松潘7.2级地震前视电阻率的短临变化特征。两个台站附近的地质、地电条件及台址基岩岩性均不相同,但在震前观测到的视电阻率曲线的变化都很相似,尤其是短临变化,无论是起始时间还是其变化率都比较一致。两次强震前观测到的视电阻率变化与岩石样品破裂实验的结果比较一致。事实表明,上述台站观测到的视电阻率短临前兆是真实的和可靠的。利用电阻率前兆手段,可以为预报类似唐山、松潘地震的无前震类型强震,提供临震前兆信息。
This paper presents the short-term variation characteristics of apparent apparent resistivity of the 1976 Tangshan 7.8 and Songpan 7.2 earthquakes recorded by Changle and Wudu stations. The geologic and geoelectric conditions near the two stations and the bedrock lithologies of the stations are all different. However, the observed changes of apparent resistivity curves before the earthquake are similar, especially the short-term and the short-term changes, Or its rate of change are more consistent. The change of apparent resistivity observed before two strong earthquakes is consistent with the result of the rock sample rupture experiment. The fact shows that the short-term apparent resistivity observed by the above stations is real and reliable. By means of resistivity precursors, it is possible to predict precursory precursory information for the prediction of strong earthquakes of the preseismic type such as Tangshan and Songpan earthquakes.