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对采用形态法、归一化变化速率法和各向异性度法提取到的吉林省内深源地震以及浅源地震前的地电阻率异常变化进行对比分析,结果表明:(1)震前地电阻率出现1~2年尺度中期异常,甚至短期异常,异常以负异常为主;(2)震前地电阻率原始月均值异常变化幅度<1%,表明数字地电仪捕捉电信号灵敏度的提高,更与台址构造密不可分;(3)震前地电阻率出现异常变化,震后恢复到正常变化形态,反映出震前震中区地下应力的变化,震后区域构造应力场重新调整并逐渐恢复的过程。
The contrastive analysis of the earth resistivity anomalies extracted from the deep-sourced earthquakes in Jilin Province and before the shallow-source earthquakes by morphological method, normalized rate of change and anisotropy method are carried out. The results show that: (1) The resistivity appeared mid-year or even short-term anomalies in 1 ~ 2 years, and the anomalies dominated by negative anomalies. (2) The anomalous variation of original monthly mean resistivity was less than 1% before the earthquake, indicating that the digital earth- But also with the structure of the site. (3) Before the earthquake, the resistivity changed abnormally and returned to the normal variation after the earthquake, reflecting the change of underground stress in the epicenter area before the earthquake. The tectonic stress field in the area after the earthquake readjusted Gradual recovery process.