Abstract

The power spectra of microseismic noise were investigated at 20 stations in the western part of the North Caucasus. The seismic stations are located on the eastern coast of the Black Sea and adjacent territories, covering various tectonic structures from the Greater Caucasus to the Scythian Platform. The night and day levels of microseisms were studied at different times of the year. The annual median seismic noise spectra were calculated. The most sensitive stations with the lowest and least differing day and night noise levels were identified, which are located in protected areas far from populated areas—Guzeripl, Gornoye, and Krasnaya Polyana. Most of the stations have an average noise level compared to the global average Peterson noise curves; at these stations, at frequencies above 1 Hz during the day, the noise level increases by at least an order of magnitude due to anthropogenic activity. Average noise levels in the 1–10 Hz frequency band were used to construct network capability maps according to the our method, with the application of empirical seismic wave attenuation curves, which are used to calculate the magnitudes of seismic sources in the region. The two areas of highest network sensitivity are visible on the maps of representative K_Рmin values: Anapa, with a level of K_Рmin = 6.0 during the day and K_Рmin = 5.5 at night, and Sochi–Krasnaya Polyana, with a level of K_Рmin = 5.5 during the day and K_Рmin = 5.0–5.5 at night.

中文翻译：

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利用网络布局和局部微震噪声水平评估北高加索西部地震网络的探测和定位能力

摘要

在北高加索西部的20个站点对微震噪声的功率谱进行了研究。地震台位于黑海东部沿海地区和邻近领土，涵盖从高加索地区到斯基底人平台的各种构造构造。在一年中的不同时间对微地震的昼夜水平进行了研究。计算了年度中值地震噪声谱。确定了昼夜噪声水平最低且差异最小的最敏感电台，它们位于远离人口稠密地区的保护区-Guzeripl，Gornoye和Krasnaya Polyana。与全球平均彼得森噪声曲线相比，大多数台站的平均噪声水平较高。在这些电台中，白天的频率超过1 Hz，由于人为活动，噪声水平至少增加了一个数量级。根据我们的方法，使用经验地震波衰减曲线，将1–10 Hz频带中的平均噪声水平用于构建网络能力图，以计算该地区地震源的震级。在代表性地图上可以看到网络敏感度最高的两个区域ķ _Рmin值：阿纳帕，与水平ķ _Рmin = 6.0白天ķ _Рmin = 5.5在夜间，和索契-卡拉斯拉雅波利亚纳，具有的电平ķ _Рmin白天= 5.5 ķ _Рmin = 5.0-5.5在夜晚。