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New Seismic Noise Models Obtained Using Very Broadband Stations

机译：使用超宽带站获得的新地震噪声模型

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It has been two decades since the last comprehensive standard model of ambient earth noise was published Peterson (Observations and modelling of seismic background noise, US Geological Survey, open-file report 93-322, 1993). The PETERSON model was updated by analyzing the absolute quietest conditions for stations within the GSN (Berger et al. in J Geophys Res 109, 2005; Mcnamara and Buland in Bull Seism Soc Am 94:1517-1527, 2004; Ringleret al. in Seismol Res Lett 81(4) 10.1785/gssrl.81.4.605, 2010). Unfortunately, both the original model and the updated models did not include any deployed station in North Africa and Middle East, which reflects the noise levels within the desert environment of those regions. In this study, a survey was conducted to create a new seismic noise model from very broadband stations which recently deployed in North Africa. For this purpose, 1 year of continuous recording of seismic noise data of the Egyptian National Seismic Network (ENSN) was analyzed in order to create a new noise model. Seasonal and diurnal variations in noise spectra were recorded at each station. Moreover, we constructed a new noise model for each individual station. Finally, we obtained a new cumulative noise model for all the stations. We compared the new high-noise model (EHNM) and new low-noise model (ELNM) with both the high-noise model (NHNM) and low-noise model (NLNM) of Peterson (Observations and modelling of seismic background noise, US Geological Survey, open-file report 93-322, 1993). The obtained noise levels are considerably lower than low-noise model of Peterson (Observations and modelling of seismic background noise, US Geological Survey, open-file report 93-322, 1993) at ultra long period band (ULP band), but they are still below the high-noise model of Peterson (Observations and modelling of seismic background noise, US Geological Survey, open-file report 93-322, 1993). The results of this study could be considered as a first step to create permanent seismic noise models for North Africa and Middle East regions.
机译：自彼得森（Peterson）发表最后一个全面的环境噪声标准模型以来已经过去了二十年（地震背景噪声的观测和建模，美国地质调查局，公开文件报告93-322，1993年）。通过分析GSN内站点的绝对最安静条件来更新PETERSON模型（Berger等人在J Geophys Res 109，2005; Mcnamara和Buland在Bull Seism Soc Am 94：1517-1527，2004; Ringleret等人在Seismol中） Res Lett 81（4）10.1785 / gssrl.81.4.605，2010）。不幸的是，原始模型和更新模型都没有在北非和中东地区部署任何站点，这反映了这些地区沙漠环境中的噪声水平。在这项研究中，进行了一项调查，以从最近在北非部署的甚宽带站创建新的地震噪声模型。为此，分析了埃及国家地震台网（ENSN）连续记录1年的地震噪声数据的过程，以创建一个新的噪声模型。在每个站点记录噪声频谱的季节性和昼夜变化。此外，我们为每个单独的电台构建了一个新的噪声模型。最后，我们获得了所有站点的新累积噪声模型。我们将新的高噪声模型（EHNM）和新的低噪声模型（ELNM）与Peterson的高噪声模型（NHNM）和低噪声模型（NLNM）进行了比较（美国地震背景噪声的观测和建模）地质调查，公开文件报告93-322，1993年）。在超长频带（ULP频带）下，所获得的噪声水平大大低于Peterson的低噪声模型（地震背景噪声的观测和建模，美国地质调查局，公开文件报告93-322，1993年），但仍低于Peterson的高噪声模型（地震背景噪声的观测和建模，美国地质调查局，1993年第93-322号公开文件）。这项研究的结果可以被认为是为北非和中东地区建立永久性地震噪声模型的第一步。

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