华南地震2026，Vol.46Issue(1)：9-17,9.DOI:10.13512/j.hndz.2026.01.02
福建地区地震背景噪声特征分析
Analysis of Seismic Ambient Noise Characteristics in Fujian Region
摘要
Abstract
To enhance the understanding of ambient noise characteristics in Fujian region and the quality of obser-vation data of Fujian Earthquake Early Warning Network,the continuous waveform data of 120 seismic stations in Fujian Earthquake Early Warning Network in 2023 were selected,and the seismic noise level and background noise characteristics in Fujian region were evaluated by using the analysis methods of seismic noise power spectral density(PSD),probability density function(PDF)and root mean square(RMS).The results show that the overall noise level of Earthquake Early Warning Network is mainly level Ⅱ,and the spatial distribution shows a certain re-gional pattern.The noise level of stations in coastal areas with dense population and frequent industrial activities is higher than that of stations in central and western mountainous areas.The analysis of noise spectrum characteristics shows that the noise in the low frequency band(<0.1 Hz)is mainly affected by temperature and humidity distur-bance and airflow,and the noise PSD value fluctuates between-170 dB and-130 dB.The noise of the horizontal channel of some stations is significantly higher than that of the vertical channel.It is suggested to strengthen the pro-tection measures of seismometers and the calibration of datum plane.The mid-frequency(0.1-1 Hz)noise is closely related to marine activities,with a PSD value about 20 dB higher than the global lowest noise model(NLNM).The dominant frequency(0.3 Hz)is 0.1 Hz offset from the global lowest noise model,and the dual-frequency microseis-mic energy in winter is slightly higher than that in summer.The high-frequency(>1 Hz)noise is dominated by hu-man noise,with significant diurnal variations.Installing away from densely populated towns or cave installation can effectively reduce interference sources around the station.关键词
背景噪声/噪声水平/功率谱密度/概率密度函数Key words
Ambient noise/Noise level/Power spectral density/Probability density function分类
天文与地球科学引用本文复制引用
巫立华,张宝剑,黄鹤凌,戴丽金,赵文波..福建地区地震背景噪声特征分析[J].华南地震,2026,46(1):9-17,9.基金项目
福建省地震局科研专项(面上)资助项目(M202401) （面上）
中国地震局监测司地震监测预警业务骨干专项任务资助项目(CEA-JCYJ-202501029)联合资助. （CEA-JCYJ-202501029）
