河北阳原台地电阻率变化分析

河北阳原台地电阻率NE测向2014年以来出现年变幅变小的年变畸变现象,经核实,这时的观测系统工作正常,而降雨量与地电阻率的异常变化具有一定的相关性,但通过褶积滤波法去除降雨量的影响后,这种异常变化依旧存在。同时,阳原台NE测向的地电阻率与自然电位在2014年的变化具有同步性,也进一步验证了异常变化的可靠性。阳原台地电阻率观测位于晋冀蒙交界地区,对地壳的应力-应变响应比较敏感,其地电阻率异常变化与1989年大同地震和1998年张北地震有较好的对应关系,并显示出持续时间长、幅度大和恢复慢的特点。因此,阳原台地电阻率异常变化的可信度较高,可为监测晋冀蒙交界地区的地震活动提供参考。

Analysis on the Anomaly of Resistivity at Yangyuan Station, Hebei Province

The Geoelectric resistivity monitoring from Yangyuan station detected that the annual amplitude of resistivity in NE direction became smaller since 2014. After verification, we found that the observation system is working properly and there was correlation between rainfall and ground resistivity. The abnormal is still exist after removing the effects of rain by convolution filtering method. The NE resistivity and natural potential changes in 2014 is synchronous, so the reliability of earth resistivity anomaly is improving. The ground resistivity variation has a good relationship with the history of earthquake group at Shanxi, Hebei and Inner Mongolia border area, such as 1989 Datong earthquake, 1998 Zhangbei earthquake, et al.. The anomaly of resistivity at Yangyuan station is sensitive to stress change of the earth crust. Therefore, the anomaly of the earth resistivity has a higher reliability to earthquake prediction, and we should pay close attention to the seismic activity at Shanxi, Hebei and Inner Mongolia border area.