Microseismic noise in northern European Russia: Seismic recordings in the town of Vorkuta |
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| Authors: | S B Kishkina A A Spivak |
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| Institution: | 1.Institute of Geosphere Dynamics,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Microseismic noise was studied in the frequency range 0.5–30 Hz in the conditions prevailing in the town of Vorkuta. A seismic
noise model was developed consisting of power spectral densities of ground motion velocity separately for daytime and nighttime
in different frequency ranges. The absolute noise level for frequencies of 1–5 Hz in Vorkuta varies between −140 and −150
dB in daytime and from −152 to −158 dB in nighttime, with the ranges for the 8-15 Hz noise being −140 to −155 dB in daytime
and −155 to −165 dB in nighttime. Well-pronounced daily variations in noise amplitude were observed in the frequency ranges
1.5–3 Hz and 14–17 Hz. The noise amplitude varies by 7 dB over 24 hours, with the amplitude of horizontal component variation
being 5 dB above that of the vertical component. The power spectral densities of ground motion velocity in the microseismic
noise involve several spectral peaks, whose central frequencies did not vary by more than 0.15 Hz during the entire period
of instrumental observation. The seismic background in the town of Vorkuta contains seismic events due to distant earthquakes
and local industrial explosions. |
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