河北省大地电场的频谱特征分析

摘要

This paper uses the maximum entropy method (MEM) to analyze geo-electric data of Changli,Xingji,Xinle,Yangyuan,Feixiang,Dabaishe stations in Hebei province,combined with geomagnetism data,to analyze the spectral features of components of the telluric electric field data.Results show that:the telluric electric field period is mainly 12 h semidiurnal wave components,with 24,8 h periodic components significantly in Hebei province;during magnetic-storms,the spectrum value is higher than in quiet diurnal variation;telluric electric field of diurnal changes of periodic components come from changing current system of outer space.The results reveal the background spectral components of geo-electric field observation in Hebei province,and provide reference for the application of telluric electric data in earthquake prediction.%采用最大熵谱(MEM)分析法,计算河北省内昌黎、兴济、新乐、阳原、肥乡、大柏舍6个大地电场台站的数据,结合地磁场数据分析河北省内各台电场数据的谱成分特征.结果表明,河北省各台大地电场周期主要是以12 h半日波成分为主,24 h、8h周期成分明显;磁暴时其谱值高于静日变化谱值;电场日变化主要周期成分来自外空间电流体系的变化.结果基本揭示了河北省内电场观测的背景谱成分特征,为电场数据在地震预报中的应用提供参考依据.