摘要
选取锡林浩特地震台2020年测震系统连续观测数据,计算背景噪声加速度功率谱密度、功率谱概率密度及1—20 Hz频段RMS值,分析该台背景噪声变化特征。研究结果表明,锡林浩特地震台三分向RMS值逐月变化规律基本一致,具体体现在:在0.01—0.1 Hz频段,水平向背景噪声值明显高于垂直向数值,差值最高可达20 dB;在0.1—1 Hz频段,三分向背景噪声值在频点0.25 Hz附近均有峰值出现,且峰值幅度呈一定季节性变化;在1—1.6 Hz频段,1—2月受新冠疫情防控影响,人类活动大幅度减少,3—12月背景噪声值有峰值出现,应为距该台约2 km的锡林浩特市人类活动所致。
This paper uses the continuous observation data of Xilinhot Seismic Station in 2020 and calculates the acceleration power spectral densities,probabilistic power spectral densities,and RMS values in the 1-20 Hz frequency band of the observation data to study the characteristics of the background noise variation of the Xilinhot Seismic Station.The results show that the threecomponent RMS values of the Xilinhot Seismic Station are basically the same from month to month.In the 0.01-0.1 Hz frequency band,the horizontal background noise values are significantly higher than the vertical component with the biggest difference of 20 dB.The background noise in the 0.1-1 Hz frequency band has a peak near 0.25 Hz;the peak amplitude has a certain seasonal variation.From March to December,the background noise value has a peak in the 1-1.6 Hz frequency band.This is mainly due to the influence of urban activities in Xilinhot City about 2 km away from the seismic station.
作者
段昊
安全
郭雷
王耀林
DUAN Hao;AN Quan;GUO Lei;WANG Yaolin(Earthquake Agency of Inner Mongolia Autonomous Region,Hohhot 010010,China;Hohhot Central Seismic Station,Inner Mongolia Autonomous Region 010010,China;Wujiahe Central Seismic Station,Inner Mongolia Autonomous Region 015323,China)
出处
《地震地磁观测与研究》
2022年第5期94-99,共6页
Seismological and Geomagnetic Observation and Research
基金
内蒙古自治区地震局局长基金(项目编号:2020JC14)
内蒙古自治区地震局局长基金(项目编号:2022JC05)。
