All nuclear explosions are banned by the Comprehensive Nuclear-Test-Ban Treaty. In the context of the treaty a verification regime was put into place to detect, locate, and characterize nuclear explosions at any time, by anyone and everywhere on the Earth. The International Monitoring System, which plays a key role in the verification regime, was set up by the Preparatory Commission of the Comprehensive Nuclear-Test-Ban Treaty Organization. Out of the several different monitoring techniques applied in the International Monitoring System the seismic waveform approach is the most effective and reliable technology for monitoring nuclear explosions underground. This study introduces a deterministic method of threshold monitoring that allows to asses a lower body wave magnitude limit of a potential seismic event in a certain geographical region, that can be detected by those seismic stations being part of the International Monitoring System network. The method is based on measurements of ambient seismic noise levels at the individual seismic stations along with global distance corrections terms for the body wave magnitude. The results suggest that an average global detection capability of approximately body wave magnitude 4.0 can be achieved using only stations from the primary seismic network of the International Monitoring System. The incorporation of seismic stations from the auxiliary seismic network leads to a slight improvement of the detection capability, while the use and analysis of wave arrivals from distances greater than 120∘\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^\circ$$\end{document} results in a significant improvement of the detection capability. Temporal variations in terms of hourly and monthly changes of the global detection capability can not be observed. Overall, comparisons between detection capability and manually retrieved body wave magnitudes from the Reviewed Event Bulletin suggest, that our method yields a more conservative estimation of the detection capability and that in reality detection thresholds might be even lower than estimated.

中文翻译：

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基于环境地震噪声测量的国际监测系统地震台网性能

《全面禁止核试验条约》禁止所有核爆炸。在该条约的背景下，建立了一个核查制度，以随时检测、定位和描述地球上任何人和任何地方的核爆炸。在核查制度中发挥关键作用的国际监测系统是由全面禁止核试验条约组织筹备委员会设立的。在国际监测系统中应用的几种不同监测技术中，地震波形方法是监测地下核爆炸的最有效和最可靠的技术。本研究介绍了一种阈值监测的确定性方法，该方法允许评估某个地理区域中潜在地震事件的体波幅度下限，这些地震台站可以检测到这些地震台站是国际监测系统网络的一部分。该方法基于对各个地震台站的环境地震噪声水平的测量以及体波幅度的全球距离校正项。结果表明，仅使用来自国际监测系统主要地震网络的台站就可以实现大约 4.0 级体波的平均全球探测能力。从辅助地震台网中加入地震台站导致检测能力略有提高，而使用和分析来自大于 120 距离的波到达∘\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{ mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^\circ$$\end{document} 导致检测能力的显着提高。无法观察到全球检测能力每小时和每月变化的时间变化。总体而言，检测能力与从审查事件公告中手动检索的体波幅度之间的比较表明，我们的方法对检测能力产生了更保守的估计，而实际上检测阈值可能甚至低于估计值。