沈北新区地震台观测地质环境评价与地电阻率异常应急处置

Observational Geological Environment Assessment and Emergency Measures for Geo-resistivity Anomaly at Shenbei Seismic Station

地电阻率观测值受多种因素影响,它不仅与测量设备本身性能有关,还与观测场地的地质构造、地形地貌、岩性条件、水文地质和气象条件变化等有关,一旦这些因素发生变化,都会引起地电阻率测值发生改变。如何快速、准确、科学地识别以上致变因素,从中提取地电阻率地震前兆异常信息是及时科学处置异常的关键所在。本文以沈北新区地震台为例,探索性地进行了地震台观测地质环境评价,并以2020年地电阻率异常变化为例,初步分析了地电阻率异常影响因素,以期为深井地电阻率异常分析与处置提供参考与探讨。

The observation of ground resistivity is affected by many factors.It is not only related to the performance of the measurement equipment itself,but also the changes in the geological structure,topography,lithology,hydrogeology,and meteorological conditions of the observation site.They may cause the earth resistivity to change.Taking the seismic station in Shenbei as an example,this paper has carried out an exploratory evaluation of the observational geological environment of the seismic station.And taking the abnormal change of the earth resistivity in 2020 as an example,preliminary analysis of the influencing factors of the earth resistivity anomaly is expected to be the deep well ground resistivity.