TY - JOUR
T1 - Seismic Time-Lapse Monitoring of Near-Surface Microbubble Water Injection by Full Waveform Inversion
AU - Nakata, Rie
AU - Jang, U. Geun
AU - Lumley, David
AU - Mouri, Takuji
AU - Nakatsukasa, Masashi
AU - Takanashi, Mamoru
AU - Kato, Ayato
N1 - Funding Information:
We thank JFE Civil Engineering & Construction Corp. for data acquisition and traveltime tomography data processing, NC Geophysical survey for data acquisition and Sato Kogyo charged for the microbubble water generation and injection experiment. The processed frequency-domain seismic data are available from https://figshare.com/s/7cbf51e2f86c670bc643.
Publisher Copyright:
© 2022. The Authors.
PY - 2022/12/28
Y1 - 2022/12/28
N2 - Monitoring time-lapse changes in subsurface physical properties of the near-surface critical zone is increasingly important with respect to climate change, environmental conservation/remediation, geohazard mitigation, and geotechnical engineering activities. Innovative controlled-source cross-well seismic monitoring surveys combined with full waveform inversion analysis enable us to map small and highly localized changes by repeatedly scanning the subsurface between borehole sensors at depth. In the Kanto Basin, Japan, we successfully monitor the dynamic transient fluid-flow effects of the subsurface injection of microbubble water, which is of interest for soil contamination remediation and preventing earthquake liquefaction. The fluid migration is detected by observing P-wave velocity changes (∼1%) within a very thin (∼1 m) sediment layer at a depth of ∼25 m. The injected microbubble water of the differential physical properties (temperature) is observed to follow geological and hydrologic preferential fluid-flow paths rather than diffusing equally in all directions away from the injection well.
AB - Monitoring time-lapse changes in subsurface physical properties of the near-surface critical zone is increasingly important with respect to climate change, environmental conservation/remediation, geohazard mitigation, and geotechnical engineering activities. Innovative controlled-source cross-well seismic monitoring surveys combined with full waveform inversion analysis enable us to map small and highly localized changes by repeatedly scanning the subsurface between borehole sensors at depth. In the Kanto Basin, Japan, we successfully monitor the dynamic transient fluid-flow effects of the subsurface injection of microbubble water, which is of interest for soil contamination remediation and preventing earthquake liquefaction. The fluid migration is detected by observing P-wave velocity changes (∼1%) within a very thin (∼1 m) sediment layer at a depth of ∼25 m. The injected microbubble water of the differential physical properties (temperature) is observed to follow geological and hydrologic preferential fluid-flow paths rather than diffusing equally in all directions away from the injection well.
UR - http://www.scopus.com/inward/record.url?scp=85145180479&partnerID=8YFLogxK
U2 - 10.1029/2022GL098734
DO - 10.1029/2022GL098734
M3 - Article
AN - SCOPUS:85145180479
SN - 0094-8276
VL - 49
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 24
M1 - e2022GL098734
ER -
