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Evaluation of the Detection and Location Capability of the Seismic Network in the Western Part of the North Caucasus Using Network Layout and Local Microseismic Noise Level

Authors
  • Malovichko, A. A.1
  • Gabsatarova, I. P.1
  • Dyagilev, R. A.1
  • Mekhryushev, D. Yu.1
  • Zvereva, A. S.1
  • 1 Geophysical Survey, Russian Academy of Sciences, Obninsk, 249035, Russia , Obninsk (Russia)
Type
Published Article
Journal
Seismic Instruments
Publisher
Pleiades Publishing
Publication Date
Mar 01, 2021
Volume
57
Issue
2
Pages
209–230
Identifiers
DOI: 10.3103/S0747923921020274
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractThe 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 KРmin values: Anapa, with a level of KРmin = 6.0 during the day and KРmin = 5.5 at night, and Sochi–Krasnaya Polyana, with a level of KРmin = 5.5 during the day and KРmin = 5.0–5.5 at night.

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