Newtonian noise and ambient ground motion for gravitational wave detectors

M.G. Beker*, J.F.J. van den Brand, E. Hennes, D.S. Rabeling

*Corresponding author for this work

Research output: Contribution to journalConference article in journalAcademicpeer-review

Abstract

Fluctuations of the local gravitational field as a result of seismic and atmospheric displacements will limit the sensitivity of ground based gravitational wave detectors at frequencies below 10 Hz. We discuss the implications of Newtonian noise for future third generation gravitational wave detectors. The relevant seismic wave fields are predominately of human origin and are dependent on local infrastructure and population density. Seismic studies presented here show that considerable seismic noise reduction is possible compared to current detector locations. A realistic seismic amplitude spectral density of a suitably quiet site should not exceed 0.5 nm/root Hz (Hz/f)(2) above 1 Hz. Newtonian noise models have been developed both analytically and by finite element analysis. These show that the contribution to Newtonian noise from surface waves due to distance source significantly reduces with depth. Seismic displacements from local source and body wave then become the dominant contributors to the Newtonian fluctuations.
Original languageEnglish
Article number012004
Number of pages9
JournalJournal of Physics: Conference Series
Volume363
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • SEISMIC NOISE
  • SENSITIVITY
  • DEPTH

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