甘肃天祝地区地电暴变化分析研究
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摘要
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.
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.
引文
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[3] 马钦忠,冯志生,宋治平,等.崇明与南京台震前地电场变化异常分析[J].地震学报,2004,26(3):304-312.
[4] 毛桐恩,席继楼,王燕琼,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):519-528.
[5] 郭建芳,李非,张秀霞,等.地电场日变幅与地电暴分析[J].地震,2010,31(3):18-23.
[6] 胡小静,付虹.云南地区地电暴变化分析研究[J].地震研究,2013,36(4):490-495.
[7] 谭大诚,席继楼,张慧,等.地电场水文地质因素及裂隙水主体渗流方向逐日计算[J].地震学报,2013,35:36-49.
[8] 谭大诚,王兰炜,赵家骝,等.潮汐地电场谐波和各向波形的影响要素[J].地球物理学报,2011,54(7):1 842-1 853.
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