Einstein Telescope (ET) is a proposed underground infrastructure in Europe to host future generations of gravitational-wave (GW) detectors. One of its design goals is to extend the observation band of terrestrial GW detectors from currently about 20 Hz down to 3 Hz. The coupling of a detector to its environment becomes stronger at lower frequencies, which makes it important to carefully analyse environmental disturbances at ET candidate sites. Seismic disturbances pose the greatest challenge since there are several important mechanisms for seismic vibrations to produce noise in ET, for example, through gravitational coupling, stray light, or through harmful constraints on the design of ET’s control system. In this paper, we present an analysis of the time-variant properties of the seismic field at the Sardinia candidate site of ET connected to anthropogenic as well as natural phenomena. We find that temporal variations of source distributions and of the noise spectra generally follow predictable trends in the form of diurnal, weekly, or seasonal cycles. Specific seismic sources were identified such as road bridges, which produce observable disturbances underground. This information can be used to adapt a detector’s seismic isolation and control system.

Di Giovanni, M., Koley, S., Ensing, J., Andric, T., Harms, J., D'Urso, D., et al. (2023). Temporal variations of the ambient seismic field at the Sardinia candidate site of the Einstein Telescope. GEOPHYSICAL JOURNAL INTERNATIONAL, 234(3), 1943-1964 [10.1093/gji/ggad178].

Temporal variations of the ambient seismic field at the Sardinia candidate site of the Einstein Telescope

Carpinelli M.;Rozza D.;
2023

Abstract

Einstein Telescope (ET) is a proposed underground infrastructure in Europe to host future generations of gravitational-wave (GW) detectors. One of its design goals is to extend the observation band of terrestrial GW detectors from currently about 20 Hz down to 3 Hz. The coupling of a detector to its environment becomes stronger at lower frequencies, which makes it important to carefully analyse environmental disturbances at ET candidate sites. Seismic disturbances pose the greatest challenge since there are several important mechanisms for seismic vibrations to produce noise in ET, for example, through gravitational coupling, stray light, or through harmful constraints on the design of ET’s control system. In this paper, we present an analysis of the time-variant properties of the seismic field at the Sardinia candidate site of ET connected to anthropogenic as well as natural phenomena. We find that temporal variations of source distributions and of the noise spectra generally follow predictable trends in the form of diurnal, weekly, or seasonal cycles. Specific seismic sources were identified such as road bridges, which produce observable disturbances underground. This information can be used to adapt a detector’s seismic isolation and control system.
Articolo in rivista - Articolo scientifico
Einstein Telescope; Gravitational waves; Seismic instruments; Seismic noise; Time-series analysis;
English
26-apr-2023
2023
234
3
1943
1964
none
Di Giovanni, M., Koley, S., Ensing, J., Andric, T., Harms, J., D'Urso, D., et al. (2023). Temporal variations of the ambient seismic field at the Sardinia candidate site of the Einstein Telescope. GEOPHYSICAL JOURNAL INTERNATIONAL, 234(3), 1943-1964 [10.1093/gji/ggad178].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/457578
Citazioni
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
Social impact