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分析了2008年5月12日汶川MS8.0地震前山东省青岛地震台地电阻率和地下水位的异常变化。对比发现,地电阻率与地下水的异常起始时间一致,其中,地下水位下降,地电阻率上升,推测产生异常的原因是,该观测区位于断裂破碎带附近,构造变形引起地下水或含水度变化的响应敏感,进而引起地电阻率的变化。此外,文中对地震前应力场的变化与电阻率的变化之间的关系也进行了探讨。
The anomaly of ground resistivity and groundwater level in Qingdao Seismostation before the MS8.0 Wenchuan earthquake on May 12, 2008 was analyzed. The comparison between ground resistivity and groundwater anomalies shows that the groundwater resistivity is consistent with the groundwater anomalous onset time. The groundwater level declines and the earth resistivity increases. The reason for the anomalies is that the observation area is located near the fault rupture zone and tectonic deformation causes changes in groundwater or water content The sensitivity of the response, which in turn causes the change of resistivity. In addition, the relationship between the change of the stress field before the earthquake and the change of the resistivity is also discussed.