泉州地震台数字地震仪台址的地脉动噪声分析
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摘要
利用2008年泉州台甚宽频带数字地震仪连续48 h和全年每月连续48 h内白天与夜间各连续4 h的地脉动记录,计算5 Hz、5 s和100 s的静态地脉动噪声功率谱密度、1/3倍频程1~20 Hz带宽各段的平均静态地脉动噪声有效值、1/3倍频程100~30 s带宽各段的平均静态地脉动加速度噪声有效值,以及上述3个频点和2个频段的地噪声在各时段的平均值与有效值随时间的变化等参数,并对其地脉动噪声水平进行综合分析。对了解近年城市建设的发展可能产生的噪声影响,寻求和提高泉州台测震观测质量的技术途径等方面具有实际意义。
Using microtremor records of continuously 48 h and the day and night each continuously 4 h on annual per month continuously 48 h of very broadband seismograph in Quanzhou seismic station of 2008,This paper calculated the power spectral density of static microtremor noise with 5 Hz,5 s and 100 s,the effective value of the average static microtremor noise at each segment with 1/3 octave and 1～20 Hz bandwidth,the average static microtremor acceleration noise effective value of each segment with 1/3 octave and 100～30 s bandwidth.The mean value of the effective value of ground noises of 3 frequency points and 2 bands at each time and section VS time changes were also calculated.This paper then analyzed its ground microtremor noise level.The results have practical significance to understand the influence of possible noises on the development of urban construction in recent years,seeking and improving the technical approach of the quality of seismic observation in Quanzhou seismic station.
Using microtremor records of continuously 48 h and the day and night each continuously 4 h on annual per month continuously 48 h of very broadband seismograph in Quanzhou seismic station of 2008,This paper calculated the power spectral density of static microtremor noise with 5 Hz,5 s and 100 s,the effective value of the average static microtremor noise at each segment with 1/3 octave and 1～20 Hz bandwidth,the average static microtremor acceleration noise effective value of each segment with 1/3 octave and 100～30 s bandwidth.The mean value of the effective value of ground noises of 3 frequency points and 2 bands at each time and section VS time changes were also calculated.This paper then analyzed its ground microtremor noise level.The results have practical significance to understand the influence of possible noises on the development of urban construction in recent years,seeking and improving the technical approach of the quality of seismic observation in Quanzhou seismic station.
引文
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[2]JSGC-01,中国数字测震台网技术规程[S].北京:地震出版社,2005.
[3]庄灿涛,阴朝民,吴忠良.数字地震观侧技术[M].北京:地震出版社,2003.
[4]巴特著,郑治真等译,朱传镇校.地球物理学中的谱分析[M].北京:地震出版社,1978.
[5]GB/T 3241-1998,倍频程和分数倍频程滤波器[S].北京:中国标准出版社,1998.
[6]Peterson,J.Observations and Modeling of Seismic background Noise[J].USGS Open File Report,1993:322.
[7]北京港震机电有限责任公司.数字地震仪参数测定软件使用手册[Z].北京:北京港震机电有限责任公司,2005.
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