Microseismic network sensitivity in case of no seismic activity

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Eva Káldy, Tomáš Fischer
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引用次数: 2

Abstract

Underground human activities, such as mining, shale gas, and oil exploitation, waste-water disposal, or geothermal plants, can cause earthquakes; therefore, they are monitored by local seismic networks. An ideal seismic network has a triangulated grid, with spacing equal twice the minimal depth and no associated industry noise. In real cases, the network sensitivity is biased by stations placed near noisy roads, factories, or in a private garden, none located at optimal nodes. The sensitivity is also a function of the detection algorithm type and setting. The goal of this case study is to suggest a work-flow for network sensitivity calculation in case of no seismic activity. In other words: how small are the earthquakes that such seismic networks would detect if they were present? Such network sensitivity is a function of stations noise level, station-source geometry, and setting of the detection algorithm. A brief theory and work-flow description is followed by two real-case demonstrations from Czech Republic, Europe: first, a proof-test on a well-studied seismically active area of West Bohemia/Vogtland and second, an application to an uprising geothermal project in Litoměřice, where no seismic activity was detected in years of monitoring.

Abstract Image

无地震活动情况下的微震台网灵敏度
地下人类活动,如采矿、页岩气和石油开采、废水处理或地热发电厂,都可能引起地震;因此,它们受到当地地震台网的监测。一个理想的地震网具有三角形网格,其间距等于最小深度的两倍,并且没有相关的工业噪声。在实际情况下,网络的灵敏度会受到放置在嘈杂道路、工厂或私人花园附近的站点的影响,而这些站点都不在最佳节点上。灵敏度也是检测算法类型和设置的函数。本案例研究的目的是建议在没有地震活动的情况下计算网络灵敏度的工作流程。换句话说:如果地震存在,这种地震网络能探测到的地震有多小?这种网络灵敏度是台站噪声水平、台源几何形状和检测算法设置的函数。简要介绍了理论和工作流程,随后介绍了来自欧洲捷克共和国的两个实际案例演示:首先,在西波西米亚/Vogtland的一个地震活跃区域进行了验证测试,其次,在Litoměřice的一个地热项目中进行了应用,该项目在多年的监测中没有发现地震活动。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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