摘要
为评估绵阳地区测震台站背景噪声水平,监控观测环境的变化情况,本文选取绵阳地区3个测震台站连续原始波形资料,通过计算背景噪声功率谱密度及相应概率密度函数分布,对比地球新噪声模型,分析本地区噪声水平的分布和变化特征。结果表明,绵阳地区3个测震台三分量背景噪声功率谱密度曲线形态一致性较好,基本处于新低噪声模型(NLNM)和新高噪声模型(NHNM)之间;测震台噪声水平主要受人类活动影响,在高频段具有明显的昼夜变化;平武台中低频段背景噪声异常增强现象客观存在,原因需进一步研究分析。
In order to evaluate the background noise level of seismic stations in Mianyang area and monitor the changes of observation environment,this paper selects the continuous original waveform data of three seismic stations in Mianyang area.By calculating the noise power spectral density and the corresponding probability density function distribution,the distribution and variation characteristics of noise level in this area are analyzed by comparing with the new noise model of the earth.The results show that the morphological consistency of the three-component background noise power spectral density curves of the three seismometers in Mianyang area is relatively good,basically between the new low noise model(NLNM)and the new high noise model(NHNM).The noise level of seismic stations in this area is mainly affected by human activities,and has obvious diurnal variation in high frequency band.The abnormal enhancement of background noise in the middle and low frequency band of Pingwu station exists objectively,but the reason of abnormal enhancement is not clear,which needs further research and analysis.
作者
唐悦洋
张映
康涛
顾鹏
TANG Yueyang;ZHANG Ying;KANG Tao;GU Peng(Emergency Management Bureau of Mianyang City,Mianyang,Sichuan 621000,China;Chengdu Seismic Monitoring Center Station of Sichuan Earthquake Agency,Chengdu,Sichuan 610041,China)
出处
《山西地震》
2025年第3期1-6,共6页
Earthquake Research in Shanxi
