基于GEI方法对苏皖地区地电活动指数的可靠性研究

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

摘要:

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D_s。同时将地电指数D、D_s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K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、D_s可以量化界定地电场活动水平。极个别的地电指数D、D_s与地磁指数K、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。

Abstract:

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 D_s 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 D_s 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 D_s. Only a few of the D and D_s 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 mainland China. This will have a wide prospect of application in the related field of earth science and technology.