地电扰动指数GEI研究  

Study on the Geoelectric Index (GEI)

作　　者：孙君嵩 杜学彬[1,2] 王丽 崔腾发[4] SUN JunSong;DU XueBin;WANG Li;CUI TengFa(Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China;Lanzhou National Observatory of Geophysics,Lanzhou 730000,China;Nanjing Seismic Station of Earthquake Administration of Jiangsu Province,Nanjing 210014,China;Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]兰州地球物理国家野外科学观测研究站,兰州730000 [3]南京基准地震台,南京210014 [4]中国地震局地质研究所,北京100029

出　　处：《地球物理学报》2018年第11期4493-4503,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(41374080)资助

摘　　要：本文应用中国大陆地区11个地电场台站5.5年(2012-01-01—2017-05-31)中磁静日和磁扰日的观测数据,并联系地电场变化敏感响应地下介质非均匀性和空间电磁活动的特点,发展了地电扰动指数,即消除静日地电变化的幅值比地电指数(GEI).对比各台站的地电指数与地磁指数,87.43%的单台地电指数D与单台地磁指数K在数值上完全相同或相差1,93.75%的单台平均地电指数Ds与单台平均地磁指数[珡K+0.5](四舍五入)相同或仅相差1,说明地电指数能用于量化界定地电扰动水平,如同地磁指数量化界定磁扰水平.地电指数将服务于地球电磁环境监测、科学研究等领域,同时也可以用来评估地电场观测数据的质量.The geoelectric index(GEI)is proposed using the observation data of geoelectric field observed at 11 stations in the China's Mainland in magnetically quiet and disturbed days from 1/1/2012 to 5/31/2017(about 5.5 years),by closely linking the facts of the sensitive response of geoelectric field variation to the inhomogeneity in the underground medium and the space electromagnetic activity on the basis of the amplitude ratio of geoelectric field after removing off the magnetically quiet variation.As compared with the geomagnetic index at each station,it can be seen that for the single indices of each station,the geoelectric indices D are in keeping with the geomagnetic indices K in the proportion of 87.43%;and that for the average index of the 11 stations,the geoelectric indices Ds are in coincidence with the geomagnetic indices[+0.5](viz.round-up)in the proportion of 93.75%.The keeping means that the geoelectric indices are numerically the same as the geomagnetic indices or that the numerical difference is just one between the geoelectric and geomagnetic indices,for same a level of index concerned.These show that the geoelectric index,GEI,defined in this paper can be used to quantify the level of geoelectric disturbance,just like quantifying the level of geomagnetic disturbance using a geomagnetic field index.It is evident that the geoelectric index is another criterion to quantify the earth′s electromagnetic disturbance level,in addition to the geomagnetic index.The geoelectric index can be applied to many fields,such as the monitoring and scientific research for the earth′s electromagnetic environment variation and related disaster events;furthermore,it can also be used to evaluate the quality of the observation data of the geoelectric field station.

关 键 词：地电场 地电指数 地电暴 地磁场 地磁指数 地磁暴 

分 类 号：P318[天文地球—固体地球物理学] P319[天文地球—地球物理学]