基于PPSD方法的广东阳江小孔径井下型地震监测台阵环境地噪声计算与分析
|
摘要
选取2014—2018年广东阳江小孔径井下型地震监测台阵记录的连续波形三分量seed观测数据,使用概率功率谱密度(Probabilistic Power Spectral Densities,以下简称PPSD)方法,对该地震监测台阵所属10个子台进行环境地噪声计算,统计数据月连续率和年连续率;通过PPSD计算获得每小时、每天、每月、每年、5年的环境地噪声结果;汇总结果并分析环境地噪声稳定性和异常性。结果显示:①各子台这5年的环境地噪声水平稳定,说明其井下台基变化和仪器运行稳定,井下观测手段能够避免地面生产生活等人为干扰,解决了因城镇长期建设发展破坏地震监测环境的难题;②存在靠近海边的子台易受台风严重干扰、无线网桥通信方式的子台数据连续率较差、仪器垂直分量相对容易出现运行异常、井下设备故障维修周期较长等问题。
Based on the Probabilistic Power Spectral Densities(PPSD) method, the environment ground noise of ten sub-stations of Yangjiang Guangdong small aperture seismic array is calculated, the total archived continuous three-component seed data of five years from 2014 to 2018 are used. The monthly and annual continuity rates of those data is calculated. The results of environment ground noise were obtained by PPSD calculation for every hour, every day, every month, every year and five years. The results are summarized to analyze the stability and anomaly of environment ground noise. The results show that the environment ground noise level of each sub-station is stable in the past five years, which indicates that the change of underground platform foundation and the status of instrument operation are stable. The underground observation can avoid the human interference of production and activity on the ground, and solve the problem that the long-term construction and development of cities which destroy the environment of earthquake monitoring. But there also have some problems such as the sub-stations close to the sea are susceptible to the typhoon interference, the poor data continuity rate of sub-stations in wireless bridge communication mode, vertical component of instrument is relatively easily to abnormal situation, long maintenance period of underground equipment broken, etc.
Based on the Probabilistic Power Spectral Densities(PPSD) method, the environment ground noise of ten sub-stations of Yangjiang Guangdong small aperture seismic array is calculated, the total archived continuous three-component seed data of five years from 2014 to 2018 are used. The monthly and annual continuity rates of those data is calculated. The results of environment ground noise were obtained by PPSD calculation for every hour, every day, every month, every year and five years. The results are summarized to analyze the stability and anomaly of environment ground noise. The results show that the environment ground noise level of each sub-station is stable in the past five years, which indicates that the change of underground platform foundation and the status of instrument operation are stable. The underground observation can avoid the human interference of production and activity on the ground, and solve the problem that the long-term construction and development of cities which destroy the environment of earthquake monitoring. But there also have some problems such as the sub-stations close to the sea are susceptible to the typhoon interference, the poor data continuity rate of sub-stations in wireless bridge communication mode, vertical component of instrument is relatively easily to abnormal situation, long maintenance period of underground equipment broken, etc.
引文
[1] 陈建涛,谢剑波,劳谦.广东阳江小孔径井下型地震监测台阵介绍[J].华南地震,2017,37(1):42-48.
[2] 陈建涛,苏柱金,黄腾浪.基于地震自动速报和COMCOT模式的南海地震监测与海啸模拟平台开发[J].华南地震,2017,37(3):55-62.
[3] McNamara D E,Buland R P.Ambient noise levels in the continental United States[J].Bulletin of the Seismological Society of America,2004,94(4):1517-1527.
[4] 王俊,缪发军,詹小艳,等.基于MATLAB的准实时背景噪声计算分析软件研制[J].地震研究,2013,36(2):231-237.
[5] Beyreuther M,Barsch R,Krischer L,et al.ObsPy:a python toolbox for seismology[J].Seismological Research Letters,2010,81(3):530-533.
[6] 谢剑波.地震记录的时间域反褶积、仿真及在地震计方位角相对测量中的应用[J].地球物理学报,2014,57(1):167-178.
[7] GB/T 19531.1—2004,地震台站观测环境技术要求第1部分:测震[S].北京:地震出版社,2004.
[8] Peterson J.Observations and modeling of seismic background noise[R].Open File Report.Albuquerque:USGS,1993:93-322.
[9] 丁莉莎,叶世山,姜喜姣.“彩虹”台风对宽频带地震计记录的影响[J].地震地磁观测与研究,2017,38(6):98-103.
[10] 林伟,蒋秀琴,叶春明,等.珠三角地震预警台站建设监理工作特点[J].华南地震,2017,37(S1):105-112.
[11] 林伟,谢剑波,刘少文.广东省地震预警台网建设规划[J].华南地震,2018,38(S1):101-107.
[2] 陈建涛,苏柱金,黄腾浪.基于地震自动速报和COMCOT模式的南海地震监测与海啸模拟平台开发[J].华南地震,2017,37(3):55-62.
[3] McNamara D E,Buland R P.Ambient noise levels in the continental United States[J].Bulletin of the Seismological Society of America,2004,94(4):1517-1527.
[4] 王俊,缪发军,詹小艳,等.基于MATLAB的准实时背景噪声计算分析软件研制[J].地震研究,2013,36(2):231-237.
[5] Beyreuther M,Barsch R,Krischer L,et al.ObsPy:a python toolbox for seismology[J].Seismological Research Letters,2010,81(3):530-533.
[6] 谢剑波.地震记录的时间域反褶积、仿真及在地震计方位角相对测量中的应用[J].地球物理学报,2014,57(1):167-178.
[7] GB/T 19531.1—2004,地震台站观测环境技术要求第1部分:测震[S].北京:地震出版社,2004.
[8] Peterson J.Observations and modeling of seismic background noise[R].Open File Report.Albuquerque:USGS,1993:93-322.
[9] 丁莉莎,叶世山,姜喜姣.“彩虹”台风对宽频带地震计记录的影响[J].地震地磁观测与研究,2017,38(6):98-103.
[10] 林伟,蒋秀琴,叶春明,等.珠三角地震预警台站建设监理工作特点[J].华南地震,2017,37(S1):105-112.
[11] 林伟,谢剑波,刘少文.广东省地震预警台网建设规划[J].华南地震,2018,38(S1):101-107.