尹天杰 孙亮亮 李章 赵桂宝



摘 要:地电暴作为地电场观测中典型的干扰类型,由于其变化机理的特殊性以及变化特征的复杂性,准确地识别地电暴的变化特征以及研究其变化机制机理,对于地电场台站的日常观测和科学研究,具有非常重要的意义。该文主要利用安徽省地震局嘉山、蒙城两个地电场台站的观测数据,对地电暴变化特征进行分析。发现地电暴具有同步性和广域性,且相比于雷电干扰变化幅度较大持续时间较长。
关键词:地电场 地电暴 磁暴 雷电干扰
中图分类号:P315 文献标识码:A文章编号:1672-3791(2021)03(c)-0104-03
Analysis on Characteristics of Geoelectric Storms at Geoelectric Field Stations in Anhui Province
YIN Tianjie1 SUN Liangliang1 LI Zhang2 ZHAO Guibao1
(1.Jiashan Seismic Station of Anhui Earthquake Agency, Mingguang, Anhui Province, 239403 China; 2.Huangshan Seismic Station of Anhui Earthquake Agency, Huangshan, Anhui Province,
242700 China)
Abstract: Geoelectric storm is a typical interference type in geoelectric field observation. Due to the particularity of its change mechanism and the complexity of its change characteristics, it is necessary to accurately identify the change characteristics of geoelectric storm and study its mechanism of change. The daily observation and scientific research are of very important significance. This paper mainly uses the observation data of the Jiashan and Mengcheng geoelectric field stations of the Anhui Earthquake Agency to analyze the characteristics of the geoelectric storm. It is found that the geoelectric storm is synchronous and wide-area, and compared with the lightning interference, the variation range is larger and the duration is longer.
Key Words: Geoelectric field; Geoelectric storm; Magnetic storm; Lightning interference
地電暴事件是地电场观测中发生最频繁的地球物理事件,导致其发生的原因来自于磁暴,磁暴的发生源于太阳日冕中的高速等离子体携带日冕磁场作用于地球磁场,从而使地球磁场发生剧烈扰动。对于此类干扰目前尚无可控机制,又加上地电暴具有高频发生的特性,因此探究其变化特征及变化机理在台站科研工作中尤为重要。
1 地电场台站概况
安徽省地震局现有蒙城、嘉山两个省属地电场台站。蒙城台和嘉山台分别于“九五”和“十一五”期间投入大地电场观测项目,蒙城台布极方法采用共用电极长短极距法,共有NS向长、短极距,EW向长、短极距,N45°W向长、短极距3个分向。嘉山台外场地布设采用三角形布极,分别有NS、EW和N45°E这3个方向,每个方向共有长、短二类极距。线路均采用架空的方式[1]。蒙城、嘉山使用的地电场主机型号均为ZD9A-2B型。
2 地电暴的识别……p>