摘要
利用红山地震台ELF极低频观测数据处理得到不同观测分量、不同频率功率谱数据的时间序列,并通过对数据进行作图分析,得出红山台电磁场功率谱密度的时间分布具有如下特征:(1)电磁场功率谱密度均具有夏强冬弱的季节分布,呈正弦波形态,夏季变化幅度是冬季的1~10倍不等;(2)不同频率上,各测项功率谱密度无多年趋势性变化特征,年际变化幅度小于年内1~3个数量级。
In the paper, power-spectrum time series of the extremely low frequency electromagnetic field in different item recorded by Hongshan standard seismic station is calculated and studied using diagraph anal-ysis. The result shows that, 1） all power-spectrum densities in each frequency and observation item have sine shaped seasonal distribution characteristics, mean that, datum are dispersed in summer and dense in winter. The variation in summer is 1 to 10 times as much as in winter. 2） power-spectrum densities in each frequency and observation item have no trend change for years, and its interannual variability is 1- 3 or-ders of magnitude less than its annual variability.
出处
《华北地震科学》
2017年第1期67-72,共6页
North China Earthquake Sciences
基金
河北省地震科技星火计划项目:ELF电磁场功率谱数据的时空分布特征研究
关键词
ELF
电磁场
功率谱密度
时间分布
红山台
ELF
electromagnetic field
power-spectrum density
time-distribution
Hongshan station
