Seismic instruments: article

Evaluation of detection and location capability of the seismic network in the western part of the North Caucasus using network layout and local microseismic noise level
Geophysical Survey of the Russian Academy of Sciences
Journal: Seismic instruments
Tome: 56
Number: 3
Year: 2020
Pages: 35-60
UDK: 550.34.034
DOI: 10.21455/si2020.3-3
Аnnotation file
Bibliographic list
Keywords: microseismic noise, seismic station, seismometer, median power spectrum, seismic network sensitivity, western part of the North Caucasus
Аnnotation: The power spectra of microseismic noise were investigated at 20 stations in the western part of the North Caucasus. 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 the 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, located in protected areas far from settlements - “Guzeripl”, “Gornoye” and “Krasnaya Polyana”, were identified. Most of the stations have an average noise level in comparison with the world 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 power due to anthropogenic activity. Average noise levels in the 1-10 Hz frequency band were used to construct network capability maps according to the developed method, applying empirical attenuation curves of seismic waves, which are used to calculate the magnitudes of seismic sources in the region. The two areas of the highest network sensitivity are visible on the maps of representative K