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1967年我国开始建立第一个地电阻率观测站以来,至今已有16年的历史。历经几次7级以上大地震,特别是唐山7.8级地震的实践,发现震前距震中一定范围内的台站,其地电阻率观测值都有不同程度的趋势异常变化。更有意义的是唐山震前10天之内还观测到大幅度的突变异常,且这种异常的台站集中分布在北东向沧东断裂带附近。松潘地震前武都地电台也记录到突变现象。另外,在某些中强地震前曾记录到短期趋势变化,然而是否存在临震突变异常还是悬案,而临震信息的研究是当前地震预报的一个极为重要的方面。
In 1967, China started its first geodetic observation station and has a history of 16 years. After several earthquakes of magnitude 7 and above, especially the magnitude 7.8 of Tangshan earthquake, it is found that the observed values of earth resistivity have varying degrees of anomalous changes in the stations within a certain range from the epicenter before the earthquake. What is more significant is that significant abnormity of abnormity has also been observed within 10 days before Tangshan earthquake, and this anomalous station is concentrated in the vicinity of the northeast to Cangdong fault zone. Before the Songpan Earthquake in Wudu, a sudden change was also recorded. In addition, some short-term trend changes have been recorded before some moderate earthquakes. However, it is still a pending case whether there is a sudden change in a temporary earthquake or not. However, the study on the temporary earthquake information is an extremely important aspect of the current earthquake prediction.