关于地震前地电阻率的变化已有文献作过报道。一般认为地电阻率年变规律是测区表层电阻率改变的结果,是应当克服的一种干扰。合肥地电台北西、东西两道测线的测值基本没有年变化,但北东向测线的电阻率(ρ_s~(NE))却存在着明显年变化,年变幅达7％。同一测 Changes in resistivity before the earthquake have been reported in the literature. It is generally believed that the annual variation law of earth resistivity is the result of the change of surface resistivity in the survey area and is an interference that should be overcome. There is almost no annual change in the measured values ​​of the northwest and east-west lines of Hefei Radio Station. However, the resistivity (ρ_s ~ (NE)) of NE line has obvious annual variation with an annual variation of 7%. The same test