Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica
Firn densification profiles are an important parameter for ice-sheet mass balance and palaeoclimate studies. One conventional method of investigating firn profiles is using seismic refraction surveys, but these are difficult to upscale to large-area measurements. Distributed acoustic sensing (DAS) p...
Published in: | Journal of Geophysical Research: Earth Surface |
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2022
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Online Access: | https://hdl.handle.net/1983/92157961-8d36-4435-9a71-ab6da6810cb9 https://research-information.bris.ac.uk/en/publications/92157961-8d36-4435-9a71-ab6da6810cb9 https://doi.org/10.1029/2022JF006917 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/92157961-8d36-4435-9a71-ab6da6810cb9 2024-02-11T09:56:18+01:00 Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica Zhou, Wen Butcher, Antony C Brisbourne, Alex Kufner, Sofia-Katerina Kendall, J M Stork, Anna L 2022-12-09 https://hdl.handle.net/1983/92157961-8d36-4435-9a71-ab6da6810cb9 https://research-information.bris.ac.uk/en/publications/92157961-8d36-4435-9a71-ab6da6810cb9 https://doi.org/10.1029/2022JF006917 eng eng info:eu-repo/semantics/openAccess Zhou , W , Butcher , A C , Brisbourne , A , Kufner , S-K , Kendall , J M & Stork , A L 2022 , ' Seismic noise interferometry and Distributed Acoustic Sensing (DAS) : Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica ' , Journal of Geophysical Research: Earth Surface , vol. 127 , no. 12 . https://doi.org/10.1029/2022JF006917 article 2022 ftubristolcris https://doi.org/10.1029/2022JF006917 2024-01-25T23:33:09Z Firn densification profiles are an important parameter for ice-sheet mass balance and palaeoclimate studies. One conventional method of investigating firn profiles is using seismic refraction surveys, but these are difficult to upscale to large-area measurements. Distributed acoustic sensing (DAS) presents an opportunity for large-scale seismic measurements of firn with dense spatial sampling and easy deployment, especially when seismic noise is used. We study the feasibility of seismic noise interferometry (SI) on DAS data for characterizing the firn layer at the Rutford Ice Stream, West Antarctica. Dominant seismic energy appears to come from anthropogenic noise and shear-margin crevasses. The DAS cross-correlation interferometry yields noisy Rayleigh wave signals. To overcome this, we present two strategies for cross-correlations: (a) hybrid instruments—correlating a geophone with DAS, and (b) stacking of selected cross-correlation panels picked in the tau-p domain. These approaches are validated with results derived from an active survey. Using the retrieved Rayleigh wave dispersion curve, we inverted for a high-resolution 1D S-wave velocity profile down to a depth of 100 m. The profile shows a “kink” (velocity gradient inflection) at ∼12 m depth, resulting from a change of compaction mechanism. A triangular DAS array is used to investigate directional variation in velocity, which shows no evident variations thus suggesting a lack of azimuthal anisotropy in the firn. Our results demonstrate the potential of using DAS and SI to image the near-surface and present a new approach to derive S-velocity profiles from surface wave inversion in firn studies. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Sheet Rutford Ice Stream West Antarctica University of Bristol: Bristol Research Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) West Antarctica Journal of Geophysical Research: Earth Surface 127 12 |
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Open Polar |
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University of Bristol: Bristol Research |
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ftubristolcris |
language |
English |
description |
Firn densification profiles are an important parameter for ice-sheet mass balance and palaeoclimate studies. One conventional method of investigating firn profiles is using seismic refraction surveys, but these are difficult to upscale to large-area measurements. Distributed acoustic sensing (DAS) presents an opportunity for large-scale seismic measurements of firn with dense spatial sampling and easy deployment, especially when seismic noise is used. We study the feasibility of seismic noise interferometry (SI) on DAS data for characterizing the firn layer at the Rutford Ice Stream, West Antarctica. Dominant seismic energy appears to come from anthropogenic noise and shear-margin crevasses. The DAS cross-correlation interferometry yields noisy Rayleigh wave signals. To overcome this, we present two strategies for cross-correlations: (a) hybrid instruments—correlating a geophone with DAS, and (b) stacking of selected cross-correlation panels picked in the tau-p domain. These approaches are validated with results derived from an active survey. Using the retrieved Rayleigh wave dispersion curve, we inverted for a high-resolution 1D S-wave velocity profile down to a depth of 100 m. The profile shows a “kink” (velocity gradient inflection) at ∼12 m depth, resulting from a change of compaction mechanism. A triangular DAS array is used to investigate directional variation in velocity, which shows no evident variations thus suggesting a lack of azimuthal anisotropy in the firn. Our results demonstrate the potential of using DAS and SI to image the near-surface and present a new approach to derive S-velocity profiles from surface wave inversion in firn studies. |
format |
Article in Journal/Newspaper |
author |
Zhou, Wen Butcher, Antony C Brisbourne, Alex Kufner, Sofia-Katerina Kendall, J M Stork, Anna L |
spellingShingle |
Zhou, Wen Butcher, Antony C Brisbourne, Alex Kufner, Sofia-Katerina Kendall, J M Stork, Anna L Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica |
author_facet |
Zhou, Wen Butcher, Antony C Brisbourne, Alex Kufner, Sofia-Katerina Kendall, J M Stork, Anna L |
author_sort |
Zhou, Wen |
title |
Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica |
title_short |
Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica |
title_full |
Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica |
title_fullStr |
Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica |
title_full_unstemmed |
Seismic noise interferometry and Distributed Acoustic Sensing (DAS):Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica |
title_sort |
seismic noise interferometry and distributed acoustic sensing (das):inverting for the firn layer s-velocity structure on rutford ice stream, antarctica |
publishDate |
2022 |
url |
https://hdl.handle.net/1983/92157961-8d36-4435-9a71-ab6da6810cb9 https://research-information.bris.ac.uk/en/publications/92157961-8d36-4435-9a71-ab6da6810cb9 https://doi.org/10.1029/2022JF006917 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Rutford Rutford Ice Stream West Antarctica |
geographic_facet |
Rutford Rutford Ice Stream West Antarctica |
genre |
Antarc* Antarctica Antarctica Journal Ice Sheet Rutford Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Sheet Rutford Ice Stream West Antarctica |
op_source |
Zhou , W , Butcher , A C , Brisbourne , A , Kufner , S-K , Kendall , J M & Stork , A L 2022 , ' Seismic noise interferometry and Distributed Acoustic Sensing (DAS) : Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica ' , Journal of Geophysical Research: Earth Surface , vol. 127 , no. 12 . https://doi.org/10.1029/2022JF006917 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2022JF006917 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
127 |
container_issue |
12 |
_version_ |
1790602164682358784 |