Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise
Ambient seismic recordings taken at broad locations across Ross Ice Shelf and a dense array near West Antarctic Ice Sheet (WAIS) Divide, Antarctica, show pervasive temporally variable resonance peaks associated with trapped seismic waves in near-surface firn layers. These resonance peaks feature spl...
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Cambridge University Press
2023
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ftdoajarticles:oai:doaj.org/article:8d12dd15a761486b955be140bbbc3129 2023-08-20T04:02:22+02:00 Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise Julien Chaput Rick Aster Marianne Karplus Nori Nakata P. Gerstoft P. D. Bromirski A. Nyblade R. A. Stephen D. A. Wiens 2023-08-01T00:00:00Z https://doi.org/10.1017/jog.2022.98 https://doaj.org/article/8d12dd15a761486b955be140bbbc3129 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143022000983/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.98 0022-1430 1727-5652 https://doaj.org/article/8d12dd15a761486b955be140bbbc3129 Journal of Glaciology, Vol 69, Pp 773-789 (2023) Ice/atmosphere interactions seismology snow Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1017/jog.2022.98 2023-07-30T00:36:44Z Ambient seismic recordings taken at broad locations across Ross Ice Shelf and a dense array near West Antarctic Ice Sheet (WAIS) Divide, Antarctica, show pervasive temporally variable resonance peaks associated with trapped seismic waves in near-surface firn layers. These resonance peaks feature splitting on the horizontal components, here interpreted as frequency-dependent anisotropy in the firn and underlying ice due to several overlapping mechanisms driven by ice flow. Frequency peak splitting magnitudes and fast/slow axes were systematically estimated at single stations using a novel algorithm and compared with good agreement with active source anisotropy measurements at WAIS Divide determined via active sources recorded on a 1 km circular array. The approach was further applied to the broad Ross Ice Shelf (RIS) array, where anisotropy axes were directly compared with visible surface features and ice shelf flow lines. The near-surface firn, depicted by anisotropy above 30 Hz, was shown to exhibit a novel plastic stretching mechanism of anisotropy, whereby the fast direction in snow aligns with accelerating ice shelf flow. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Journal of Glaciology Ross Ice Shelf Directory of Open Access Journals: DOAJ Articles Antarctic Ross Ice Shelf West Antarctic Ice Sheet Journal of Glaciology 1 17 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice/atmosphere interactions seismology snow Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Ice/atmosphere interactions seismology snow Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Julien Chaput Rick Aster Marianne Karplus Nori Nakata P. Gerstoft P. D. Bromirski A. Nyblade R. A. Stephen D. A. Wiens Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise |
topic_facet |
Ice/atmosphere interactions seismology snow Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Ambient seismic recordings taken at broad locations across Ross Ice Shelf and a dense array near West Antarctic Ice Sheet (WAIS) Divide, Antarctica, show pervasive temporally variable resonance peaks associated with trapped seismic waves in near-surface firn layers. These resonance peaks feature splitting on the horizontal components, here interpreted as frequency-dependent anisotropy in the firn and underlying ice due to several overlapping mechanisms driven by ice flow. Frequency peak splitting magnitudes and fast/slow axes were systematically estimated at single stations using a novel algorithm and compared with good agreement with active source anisotropy measurements at WAIS Divide determined via active sources recorded on a 1 km circular array. The approach was further applied to the broad Ross Ice Shelf (RIS) array, where anisotropy axes were directly compared with visible surface features and ice shelf flow lines. The near-surface firn, depicted by anisotropy above 30 Hz, was shown to exhibit a novel plastic stretching mechanism of anisotropy, whereby the fast direction in snow aligns with accelerating ice shelf flow. |
format |
Article in Journal/Newspaper |
author |
Julien Chaput Rick Aster Marianne Karplus Nori Nakata P. Gerstoft P. D. Bromirski A. Nyblade R. A. Stephen D. A. Wiens |
author_facet |
Julien Chaput Rick Aster Marianne Karplus Nori Nakata P. Gerstoft P. D. Bromirski A. Nyblade R. A. Stephen D. A. Wiens |
author_sort |
Julien Chaput |
title |
Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise |
title_short |
Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise |
title_full |
Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise |
title_fullStr |
Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise |
title_full_unstemmed |
Near-surface seismic anisotropy in Antarctic glacial snow and ice revealed by high-frequency ambient noise |
title_sort |
near-surface seismic anisotropy in antarctic glacial snow and ice revealed by high-frequency ambient noise |
publisher |
Cambridge University Press |
publishDate |
2023 |
url |
https://doi.org/10.1017/jog.2022.98 https://doaj.org/article/8d12dd15a761486b955be140bbbc3129 |
geographic |
Antarctic Ross Ice Shelf West Antarctic Ice Sheet |
geographic_facet |
Antarctic Ross Ice Shelf West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Journal of Glaciology Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Journal of Glaciology Ross Ice Shelf |
op_source |
Journal of Glaciology, Vol 69, Pp 773-789 (2023) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143022000983/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.98 0022-1430 1727-5652 https://doaj.org/article/8d12dd15a761486b955be140bbbc3129 |
op_doi |
https://doi.org/10.1017/jog.2022.98 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
17 |
_version_ |
1774712789871362048 |