甘肃天祝地区地电暴变化分析研究

ANALYSIS AND RESEARCH ON GEOELECTRIC STORM VARIATION IN TIANZHU REGION IN GANSU PROVINCE

针对2015年发生的4次磁情指数K≥6的磁暴事件,分析了甘肃天祝地区松山、寺滩和古丰地电场在磁暴发生期间的观测数据,结果表明:地电场各测向均记录到同步的地电暴变化,其最大变幅均明显高于正常日变;对同一场地地电场,其变化幅度与磁情指数K呈正相关;对不同场地地电场,因其对磁暴的响应程度不同,其变幅差别很大,这可能与地下岩石、裂隙、含水度及渗透率等水文地质因素及台址介质的电性结构有关。

Based on 6 geomagnetic storm events with geomagnetic index K ≥6 in 2015, the geoelectric field data in Songshan, Sitan and Gufeng stations are analyzed. The results show that the geoelectric storm data changes were recorded in the geoelectric field data, and the maximum variation amplitude of the geoelectric field was significantly higher than the normal diurnal variation during the occurrence of geomagnetic storm. For the same geoelectric field, the variation amplitude of the geoelectric field is positively correlated with the geomagnetic index K. For the different geoelectric field, the response degree of the geoelectric field to the magnetic storm varies greatly, which may be related to the electric property structure of the station.