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Mixed space-time spectral analysis was applied for the detection of seismicwaves passing through the west-end building of the Virgo interferometer. Themethod enables detection of every single passing wave, including its frequency,length, direction, and amplitude. A thorough analysis aimed to improvingsensitivity of the Virgo detector was made for the data gathered by 38 seismicsensors, in the two-week measurement period, from 24 January to 6 February2018, and for frequency range 5--20 Hz. Two dominant seismic-wave frequencieswere found: 5.5 Hz and 17.1 Hz. The possible sources of these waves wereidentified, that is, the nearby industrial complex for the frequency 5.5 Hz anda small object 100 m away from the west-end buiding for 17.1 Hz. The obtainedresults are going to be used to provide better estimation of the newtoniannoise near the Virgo interferometer.

Application of space-time spectral analysis for detection of seismic waves in gravitational-wave interferometer