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Estimation of Background Noise for International Monitoring System Seismic Stations

机译：国际监测系统地震台站背景噪声的估算

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摘要

— The prototype International Data Centre (IDC) in Arlington, Virginia has been acquiring data from seismic stations at locations designated in the Comprehensive Test-Ban Treaty for the International Monitoring System (IMS) since the start of 1995. A key characteristic of these stations is their background noise levels and their seasonal and diurnal variability. Since June 1997 an automated sample selection effort has collected over 700,000 individual noise sample spectra from 39 primary and 57 auxiliary stations. Monthly median and 5 and 95 percentile estimates have been calculated for each channel of every station. Compatibility of median spectra obtained for the same station and channel in the same month for two different years confirms the consistency of the noise-sampling algorithm used. A preliminary analysis of the results shows strong (more than a factor of two) seasonal variation at a quarter of all stations. Strong diurnal variations at half of the sites indicate that many of the selected sites are poorly located with respect to cultural noise sources. The results of this study are already being used to evaluate station quality, improve those processes that require background noise values, such as automatic association and requesting auxiliary station data, and to improve the estimation of station and network detection and location thresholds.
机译：—自1995年初以来，位于弗吉尼亚州阿灵顿的原型国际数据中心（IDC）一直在从国际监测系统（IMS）的《全面禁试条约》指定的地点的地震台获取数据。这些台站的主要特征是它们的背景噪声水平以及它们的季节性和昼夜变化。自1997年6月以来，自动样本选择工作已从39个主要站点和57个辅助站点收集了700,000多个单独的噪声样本频谱。已为每个电台的每个频道计算了每月中位数以及5％和95％的估计值。在同一月和同一月在不同年份获得的同一台站和频道的频谱中值的兼容性证实了所使用的噪声采样算法的一致性。对结果的初步分析显示，所有站点的四分之一都存在强烈的季节性变化（超过两倍）。半数地点的昼夜变化很大，表明许多选定地点相对于文化噪声源而言位置较差。这项研究的结果已用于评估站点质量，改善那些需要背景噪声值的过程，例如自动关联和请求辅助站点数据，以及改善对站点和网络检测以及位置阈值的估计。

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  • 来源
    《Pure and Applied Geophysics》 |2002年第5期|911-944|共34页
  • 作者

    M. Bahavar; R. North;

  • 作者单位

    Center for Monitoring Research 1300 North 17th Street Suite 1450 Arlington VA 22209 U.S.A.;

    Center for Monitoring Research 1300 North 17th Street Suite 1450 Arlington VA 22209 U.S.A.;

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  • 正文语种 eng
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  • 关键词

    Key words: Seismic; noise; IMS network; CTBT.;

    机译：关键词：地震;噪声;IMS网络;全面禁试条约。;

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