【摘要】 通过对淮南地震台2009～2011年电磁扰动观测数据的分析,得到如下结论:①电磁扰动三个通道均有明显的日变化规律:00:00～07:00观测数据在均值附近波动,无脉冲变化;07:00～22:00三个通道的变化幅度均出现明显增强,22:00～24:00又恢复平稳变化。通过与环境因素及淮北台电磁扰动的对比,认为环境噪声水平是影响电磁扰动日变的主要因素。②傅里叶分析结果显示电磁扰动子夜均值有明显的365、183、122 d周期,其中365 d年周期振幅最大。第一、二通道电磁扰动子夜均值冬季低,夏季高,第三通道与前两通道年变化相反。③温度对电磁绕输出信号影响的实验初步证实了温度改变时,电磁扰动三个通道的输出均有同步的响应,且理论计算与实际观测的变化幅度基本一致。因此,认为电磁扰动的年变主要是受气温的影响。更多还原

【Abstract】 In this paper,we analyzed the observation data of electromagnetic disturbance at Huainan station in Anhui province from 2009~2011,and the results are summarized as follows.①All three channels of electromagnetic disturbance show a clear daily variation rules corresponding to the human activity: high at work hours(07:00～22:00),and low at night time(00:00～07:00).Compared the variation of electromagnetic disturbance with environmental factors(temperature,air pressure etal.) and the same time of Huaibei’s electromagnetic disturbance,the results show that main factor influencing the daily variations is the environmental noises.② Midnight average values have clearly revealed periodicities of 365、183、122 days based on Fourier transform,and the power spectral of 365-day is the highest in all periods.Midnight average values of the first and second channels were having same changes: high in summer and low in winter,but the third channel change on the contrary.③ Through analysis on the measured data,it was found that the experimental results make it clear that all three channels data of electromagnetic disturbance change with responding to ambient temperature change.And the theory calculation of electromagnetic disturbance affected by temperature change is consistent with the observation.So,we inclined to believe that the annual variation of ambient temperature is the main factor influencing the annual variation of electromagnetic disturbance at Huainan station.更多还原