基于GEI方法对苏皖地区地电活动指数的可靠性研究

使用地电扰动幅度与静日变化幅值比的地电活动指数(GEI)计算方法,连续计算江苏、安徽两省6个地电场台站2018年第一季度的单台地电指数D、平均地电指数Ds。同时将地电指数D、Ds与单台地磁指数K、平均地磁指数K(即[K+0.5])对比得到:86.48%的指数D与指数K完全相同或仅相差1,89.44%的指数D s与指数完全相同或仅相差1。两类电、磁指数的高度吻合说明:(1)连续产出的地电指数是可靠的。(2)地电指数D、Ds可以量化界定地电场活动水平。极个别的地电指数D、Ds与地磁指数K、仍存在一定差异,这与地电场台站观测有关,提升地电场观测资料的质量能更好地确定地电指数。(3)地电指数与地磁指数相互弥补能更准确地确定地球电磁活动水平,其在相关的地球科学技术领域有广泛的应用前景。

Reliability of Geoelectric Activity Indexes in Jiangsu andAnhui Provinces Based on GEI Method

In this study,in the first quarter of 2018,the single-station geoelectric index D and multi-station average geoelectric index D s were determined using the geoelectric index(GEI)method based on observation data of 6 stations in Jiangsu and Anhui Provinces.Comparing the index D and Ds with single-station geomagnetic index K and average geomagnetic index K of the 6 stations,it was found that:86.48%of D indexes are correspondingly the same with K indexes or have only a difference of 1,and 89.44%of Ds indexes are correspondingly the same with K indexes or have only a difference of 1.The high consistency between two types of indexes showed that:(1)the geoelectric index calculated by this method is reliable;(2)the electromagnetic activity level can be quantitatively identified by geoelectric indexes D and Ds.Only a few of the D and Ds indexes have a slight difference from the K and K indexes,but the problem can be well solved if the measurement accuracy of geoelectric field is improved or the measurement data from more stations are used in the calculation;(3)In the future,the mutual compensation and reference between the geoelectric and geomagnetic indexes will more accurately identify the earth’s electromagnetic activity level in China's Mainland.This will have a wide prospect of application in the related field of earth science and technology.