【摘要】 选取首都圈地区红山、昌黎、怀来、昌平流村、密云牛栏山等11个地震台的数字电磁波资料,利用最大熵谱法,对其分钟值和时值资料进行谱成分分析,发现数字电磁波日变化12h半日波和24h全日波的成分较强。通过环境调研和对比分析,总结数字电磁波的常见干扰源为地电阻率干扰和地铁干扰等,干扰形态分别为地电阻率供电时段5min左右的远超数字电磁波本底的扰动和地铁运行时段的正脉冲变化。更多还原

【Abstract】 The spectrum characteristics of electromagnetic diurnal variation have been identified by maximum entropy method,based on electromagnetic data from eleven stations at Chinese metropolitan area,including Hongshan,Changli and Huailai,etc.This study shOws that,the amplitude of the 12 h and 24-25 h semidiurnal wave is larger than others.The disturbance sources of electromagnetic date include geo-resistivity power supply and subway interference.The interference pattern caused by supplying periods of earth resistivity is electromagnetic disturbance far more than the background about 5 min,and that caused by subway is positive pulse change at the running time.更多还原