Monitoring seasonal variations in seismic velocity and groundwater levels in Harvey, Western Australia using borehole ambient seismic noise interferometry

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Authors

Leiyu He , Erdinc Saygin , David Lumley, Chaoying Bai

Abstract

In order to explore the relationships between environmental subsurface changes and seismic velocities, we use nearly four years (2015-2018) of continuous ambient seismic noise data recorded in a multi-level borehole sensor array to measure relative seismic velocity changes at the SW Hub CO2 Geosequestration Site in Harvey, Western Australia using seismic noise interferometry. We find a direct correlation between seismic velocity and seasonal groundwater changes, where seismic velocity changes follow groundwater level changes. Our rock and fluid physics modeling are highly consistent with the observations suggesting the seismic velocity changes are a direct result of groundwater table fluctuations.

DOI

https://doi.org/10.31223/osf.io/sdegk

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

seismic noise, groundwater, Green's function, velocity change

Dates

Published: 2020-01-30 07:31

Last Updated: 2020-06-24 00:26

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License

CC BY Attribution 4.0 International

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