Seismic noise characterisation at a potential gravitational wave detector site in Australia

Author:

Satari HamidORCID,Blair CarlORCID,Ju Li,Blair DavidORCID,Zhao Chunnong,Saygin Erdinc,Meyers Patrick,Lumley David

Abstract

Abstract A critical consideration in the design of next-generation gravitational wave detectors is the understanding of the seismic environment that can introduce coherent and incoherent noise of seismic origin at different frequencies. We present detailed low-frequency ambient seismic noise characterisation (0.1–10 Hz) at the Gingin site in Western Australia. Unlike the microseism band (0.06–1 Hz) for which the power shows strong correlations with nearby buoy measurements in the Indian Ocean, the seismic spectrum above 1 Hz is a complex superposition of wind induced seismic noise and anthropogenic seismic noise which can be characterised using beamforming to distinguish between the effects of coherent and incoherent wind induced seismic noise combined with temporal variations in the spatio-spectral properties of seismic noise. This also helps characterise the anthropogenic seismic noise. We show that wind induced seismic noise can either increase or decrease the coherency of background seismic noise for wind speeds above 6 m s−1 due to the interaction of wind with various surface objects. In comparison to the seismic noise at the Virgo site, the secondary microseism (0.2 Hz) noise level is higher in Gingin, but the seismic noise level between 1 and 10 Hz is lower due to the sparse population and absence of nearby road traffic.

Funder

Australian Research Council (ARC) Centre of Excellence for Gravitational Wave Discovery

CSIRO Deep Earth Imaging Future Science Platform

Australian Research Council LIEF grant

Publisher

IOP Publishing

Subject

Physics and Astronomy (miscellaneous)

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