Time-distribution Characteristic of Power-spectrum Density of ELF Electromagnetic Observations in Hongshan Station
SONG Zhao
LUO Na
ZHAO Zhi-yuan
GAO Deng-ping
WANG Xiu-min
XIE Zhen
Abstract：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 analysis.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 orders of magnitude less than its annual variability.
Keywords：ELFelectromagnetic fieldpower-spectrum densitytime-distributionHongshan station
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 67-72 )