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武都地电台自1974年12月以来,已观测到不少震前地电阻率突变的现象,特别是1976年8月16日四川松潘7.2级地震前后,以及距该台50公里范围内的很多小地震,都较好地显示了震前突然下降的特点。为了探讨震前地电阻率的突然下降现象与一定范围内的地震的发生是否有内在的联系,现将我台对应地震较好的一条测线(平行Ⅰ道,方向北西73°)观测到的部分短临异常资料提出来供大家讨论。
Since December 1974, many radio stations in Wudu County have observed abrupt changes in resistivity, especially before and after the M7.2 earthquake in Songpan, Sichuan on August 16, 1976, and within a distance of 50 km from the station Small earthquakes all better show the sudden drop before the earthquake. In order to investigate whether the sudden drop of resistivity before earthquakes is intrinsically linked to the occurrence of earthquakes within a certain range, we have observed that the corresponding earthquakes (parallel Ⅰ, 73 ° NW) Some short-term anomalies are presented for discussion.