Journal
REMOTE SENSING
Volume 13, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/rs13142684
Keywords
pore pressure monitoring; passive image interferometry; seismic interferometry; ambient noise; coda-based monitoring; Groningen
Categories
Funding
- Dutch Research Council (NWO) [DeepNL.2018.033]
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This study develops a physics-based model to explain how fluctuations in groundwater table and pore pressure affect seismic velocity variations. The results demonstrate that this model can be used for monitoring pore pressure and effectively predict changes in seismic velocity.
Previous studies examining the relationship between the groundwater table and seismic velocities have been guided by empirical relationships only. Here, we develop a physics-based model relating fluctuations in groundwater table and pore pressure with seismic velocity variations through changes in effective stress. This model justifies the use of seismic velocity variations for monitoring of the pore pressure. Using a subset of the Groningen seismic network, near-surface velocity changes are estimated over a four-year period, using passive image interferometry. The same velocity changes are predicted by applying the newly derived theory to pressure-head recordings. It is demonstrated that the theory provides a close match of the observed seismic velocity changes.
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