Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica
We recorded the ice motion and icequakes on the floating part of Langhovde Glacier in East Antarctica to better understand the dynamic behavior of ice shelves and floating tongues. Diurnal and semi-diurnal variations in ice motion and seismicity were simultaneously observed at all four global naviga...
Published in: | Annals of Glaciology |
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Cambridge University Press
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ftdoajarticles:oai:doaj.org/article:f718c37d835148f48f5e838eb3f87403 2023-05-15T13:29:34+02:00 Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica Masahiro Minowa Evgeny A. Podolskiy Shin Sugiyama 2019-09-01T00:00:00Z https://doi.org/10.1017/aog.2019.25 https://doaj.org/article/f718c37d835148f48f5e838eb3f87403 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305519000259/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.25 0260-3055 1727-5644 https://doaj.org/article/f718c37d835148f48f5e838eb3f87403 Annals of Glaciology, Vol 60, Pp 57-67 (2019) Antarctic glaciology ice shelves ice dynamics Seismicity Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/aog.2019.25 2023-03-12T01:31:55Z We recorded the ice motion and icequakes on the floating part of Langhovde Glacier in East Antarctica to better understand the dynamic behavior of ice shelves and floating tongues. Diurnal and semi-diurnal variations in ice motion and seismicity were simultaneously observed at all four global navigation satellite system and three seismic stations over 2 weeks. The short-term along-flow ice motion is explained by the elastic response of the glacier to ocean tide-induced hydrostatic stress variations, which decayed at a rate of 0.8 km−1 toward the grounding line. We observed a large number of icequakes during mid-rising and high tides that covered a broad frequency range and formed two major groups of events centered at 10 and 120 Hz, respectively. The hourly occurrence rates were ~500 events h−1, with the observed seismicity consistent with fracture due to floating tongue bending. We also observed minor secondary peaks at high ice speeds, which could reflect surface cracking due to stretching or basal friction. Our observation demonstrates that tidal-modulation was the main factor to fracture the floating tongue of Langhovde Glacier. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Shelves Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Langhovde ENVELOPE(39.733,39.733,-69.217,-69.217) Langhovde Glacier ENVELOPE(39.783,39.783,-69.200,-69.200) Annals of Glaciology 60 79 57 67 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic glaciology ice shelves ice dynamics Seismicity Meteorology. Climatology QC851-999 |
spellingShingle |
Antarctic glaciology ice shelves ice dynamics Seismicity Meteorology. Climatology QC851-999 Masahiro Minowa Evgeny A. Podolskiy Shin Sugiyama Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
topic_facet |
Antarctic glaciology ice shelves ice dynamics Seismicity Meteorology. Climatology QC851-999 |
description |
We recorded the ice motion and icequakes on the floating part of Langhovde Glacier in East Antarctica to better understand the dynamic behavior of ice shelves and floating tongues. Diurnal and semi-diurnal variations in ice motion and seismicity were simultaneously observed at all four global navigation satellite system and three seismic stations over 2 weeks. The short-term along-flow ice motion is explained by the elastic response of the glacier to ocean tide-induced hydrostatic stress variations, which decayed at a rate of 0.8 km−1 toward the grounding line. We observed a large number of icequakes during mid-rising and high tides that covered a broad frequency range and formed two major groups of events centered at 10 and 120 Hz, respectively. The hourly occurrence rates were ~500 events h−1, with the observed seismicity consistent with fracture due to floating tongue bending. We also observed minor secondary peaks at high ice speeds, which could reflect surface cracking due to stretching or basal friction. Our observation demonstrates that tidal-modulation was the main factor to fracture the floating tongue of Langhovde Glacier. |
format |
Article in Journal/Newspaper |
author |
Masahiro Minowa Evgeny A. Podolskiy Shin Sugiyama |
author_facet |
Masahiro Minowa Evgeny A. Podolskiy Shin Sugiyama |
author_sort |
Masahiro Minowa |
title |
Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
title_short |
Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
title_full |
Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
title_fullStr |
Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
title_full_unstemmed |
Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
title_sort |
tide-modulated ice motion and seismicity of a floating glacier tongue in east antarctica |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/aog.2019.25 https://doaj.org/article/f718c37d835148f48f5e838eb3f87403 |
long_lat |
ENVELOPE(39.733,39.733,-69.217,-69.217) ENVELOPE(39.783,39.783,-69.200,-69.200) |
geographic |
Antarctic East Antarctica Langhovde Langhovde Glacier |
geographic_facet |
Antarctic East Antarctica Langhovde Langhovde Glacier |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Shelves |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Shelves |
op_source |
Annals of Glaciology, Vol 60, Pp 57-67 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305519000259/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.25 0260-3055 1727-5644 https://doaj.org/article/f718c37d835148f48f5e838eb3f87403 |
op_doi |
https://doi.org/10.1017/aog.2019.25 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
57 |
op_container_end_page |
67 |
_version_ |
1766001262814298112 |