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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Online Access: | http://hdl.handle.net/2115/75671 https://doi.org/10.1017/aog.2019.25 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/75671 2023-05-15T13:29:11+02:00 Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica Minowa, Masahiro Podolskiy, Evgeny A. Sugiyama, Shin http://hdl.handle.net/2115/75671 https://doi.org/10.1017/aog.2019.25 eng eng Cambridge University Press http://hdl.handle.net/2115/75671 Annals of glaciology, 60(79): 57-67 http://dx.doi.org/10.1017/aog.2019.25 https://creativecommons.org/licenses/by/4.0/ CC-BY Antarctic glaciology ice shelves ice dynamics Seismicity 450 article fthokunivhus https://doi.org/10.1017/aog.2019.25 2022-11-18T01:05:33Z 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 similar to 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 Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) 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 |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Antarctic glaciology ice shelves ice dynamics Seismicity 450 |
spellingShingle |
Antarctic glaciology ice shelves ice dynamics Seismicity 450 Minowa, Masahiro Podolskiy, Evgeny A. Sugiyama, Shin Tide-modulated ice motion and seismicity of a floating glacier tongue in East Antarctica |
topic_facet |
Antarctic glaciology ice shelves ice dynamics Seismicity 450 |
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 similar to 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 |
Minowa, Masahiro Podolskiy, Evgeny A. Sugiyama, Shin |
author_facet |
Minowa, Masahiro Podolskiy, Evgeny A. Sugiyama, Shin |
author_sort |
Minowa, Masahiro |
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 |
url |
http://hdl.handle.net/2115/75671 https://doi.org/10.1017/aog.2019.25 |
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_relation |
http://hdl.handle.net/2115/75671 Annals of glaciology, 60(79): 57-67 http://dx.doi.org/10.1017/aog.2019.25 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
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_ |
1765999107751542784 |