地震地磁观测与研究2025，Vol.46Issue(1)：64-70,7.DOI:10.3969/j.issn.1003-3246.2025.01.009
台基观测方式改变对地震台站背景噪声的影响
The impact of changes in the observation method of seismic stations on the background noise of seismic stations
摘要
Abstract
In July 2020,the observation method of the station base of the Zhongba Seismic Station in Xizang Autonomous Region was transformed from the underground pit pier to the surface observation.After the transformation,the vertical height was increased by nearly 2.3 m.Other conditions remained unchanged.The noise power spectral density PSD and corresponding probability density function PDF were calculated at different times before and after the transformation of the station base.The Basu Seismic Station that has not undergone base transformation is used as the reference station(the layout of the observation room and related facilities of the two stations are basically the same).The PSDs and corresponding PDF values of the two stations in 2019-2021 are calculated to evaluate the impact of observation method changes on the background noise of the Zhongba Seismic Station base.The results show that after the pier renovation,the monthly and daily noise level of the station base of the Zhongba seismic station increased significantly in the high-frequency band range of 2-50 Hz(period 0.02-0.5 s),indicating that the noise generated by human activities and vehicle driving has increased significantly.Seismometers are more likely to record artificial noise signals around the station,and the quality of the base is significantly reduced.Therefore,when building and renovating seismic stations,the observation method of the base should be carefully changed.关键词
观测方式/地震台站/台基噪声水平/噪声功率谱密度/概率密度函数Key words
observation method/seismic station/station base noise level/noise power spectral density/probability density function引用本文复制引用
白玛桑布,单增曲珠,洛桑罗布,普穷..台基观测方式改变对地震台站背景噪声的影响[J].地震地磁观测与研究,2025,46(1):64-70,7.基金项目
西藏自治区地震局自设科研项目(项目编号:XDZ-202401005) （项目编号:XDZ-202401005）
