Glacier sliding, seismicity and sediment entrainment
International audience The evolution of glaciers and ice sheets depends on processes in the subglacial environment. Shear seismicity along the ice-bed interface provides a window into these processes. Such seismicity requires a rapid loss of strength that is typically ascribed to rate-weakening fric...
Published in: | Annals of Glaciology |
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Online Access: | https://hal.science/hal-02395973 https://hal.science/hal-02395973/document https://hal.science/hal-02395973/file/Lipovsky2019.pdf https://doi.org/10.1017/aog.2019.24 |
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ftunigrenoble:oai:HAL:hal-02395973v1 2024-05-12T07:53:04+00:00 Glacier sliding, seismicity and sediment entrainment Lipovsky, Bradley Paul Meyer, Colin, R Zoet, Lucas, K Mccarthy, Christine Hansen, Dougal, D Rempel, Alan, W Gimbert, Florent Mécanique des failles Institut des Sciences de la Terre (ISTerre) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) 2019-09 https://hal.science/hal-02395973 https://hal.science/hal-02395973/document https://hal.science/hal-02395973/file/Lipovsky2019.pdf https://doi.org/10.1017/aog.2019.24 en eng HAL CCSD Cambridge University Press info:eu-repo/semantics/altIdentifier/doi/10.1017/aog.2019.24 hal-02395973 https://hal.science/hal-02395973 https://hal.science/hal-02395973/document https://hal.science/hal-02395973/file/Lipovsky2019.pdf doi:10.1017/aog.2019.24 http://creativecommons.org/licenses/by-nc-sa/ info:eu-repo/semantics/OpenAccess ISSN: 0260-3055 EISSN: 1727-5644 Annals of Glaciology https://hal.science/hal-02395973 Annals of Glaciology, 2019, 60 (79), pp.182-192. ⟨10.1017/aog.2019.24⟩ glacier mechanics processes and landforms of glacial erosion seismicity seismology subglacial processes [SDE.ES]Environmental Sciences/Environment and Society info:eu-repo/semantics/article Journal articles 2019 ftunigrenoble https://doi.org/10.1017/aog.2019.24 2024-04-18T03:39:10Z International audience The evolution of glaciers and ice sheets depends on processes in the subglacial environment. Shear seismicity along the ice-bed interface provides a window into these processes. Such seismicity requires a rapid loss of strength that is typically ascribed to rate-weakening friction, i.e., decreasing friction with sliding or sliding rate. Many friction experiments have investigated glacial materials at the temperate conditions typical of fast flowing glacier beds. To our knowledge, however, these studies have all found rate-strengthening friction. Here, we investigate the possibility that rate-weakening rock-on-rock friction between sediments frozen to the bottom of the glacier and the underlying water-saturated sediments or bedrock may be responsible for subglacial shear seismicity along temperate glacier beds. We test this 'entrainment-seismicity hypothesis' using targeted laboratory experiments and simple models of glacier sliding, seismicity and sediment entrainment. These models suggest that sediment entrainment may be a necessary but not sufficient condition for the occurrence of basal shear seismicity. We propose that stagnation at the Whillans Ice Stream, West Antarctica may be caused by the growth of a frozen fringe of entrained sediment in the ice stream margins. Our results suggest that basal shear seismicity may indicate geomorphic activity. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica West Antarctica Whillans Ice Stream Université Grenoble Alpes: HAL West Antarctica Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Whillans Ice Stream ENVELOPE(-145.000,-145.000,-83.667,-83.667) Annals of Glaciology 60 79 182 192 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
glacier mechanics processes and landforms of glacial erosion seismicity seismology subglacial processes [SDE.ES]Environmental Sciences/Environment and Society |
spellingShingle |
glacier mechanics processes and landforms of glacial erosion seismicity seismology subglacial processes [SDE.ES]Environmental Sciences/Environment and Society Lipovsky, Bradley Paul Meyer, Colin, R Zoet, Lucas, K Mccarthy, Christine Hansen, Dougal, D Rempel, Alan, W Gimbert, Florent Glacier sliding, seismicity and sediment entrainment |
topic_facet |
glacier mechanics processes and landforms of glacial erosion seismicity seismology subglacial processes [SDE.ES]Environmental Sciences/Environment and Society |
description |
International audience The evolution of glaciers and ice sheets depends on processes in the subglacial environment. Shear seismicity along the ice-bed interface provides a window into these processes. Such seismicity requires a rapid loss of strength that is typically ascribed to rate-weakening friction, i.e., decreasing friction with sliding or sliding rate. Many friction experiments have investigated glacial materials at the temperate conditions typical of fast flowing glacier beds. To our knowledge, however, these studies have all found rate-strengthening friction. Here, we investigate the possibility that rate-weakening rock-on-rock friction between sediments frozen to the bottom of the glacier and the underlying water-saturated sediments or bedrock may be responsible for subglacial shear seismicity along temperate glacier beds. We test this 'entrainment-seismicity hypothesis' using targeted laboratory experiments and simple models of glacier sliding, seismicity and sediment entrainment. These models suggest that sediment entrainment may be a necessary but not sufficient condition for the occurrence of basal shear seismicity. We propose that stagnation at the Whillans Ice Stream, West Antarctica may be caused by the growth of a frozen fringe of entrained sediment in the ice stream margins. Our results suggest that basal shear seismicity may indicate geomorphic activity. |
author2 |
Mécanique des failles Institut des Sciences de la Terre (ISTerre) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) |
format |
Article in Journal/Newspaper |
author |
Lipovsky, Bradley Paul Meyer, Colin, R Zoet, Lucas, K Mccarthy, Christine Hansen, Dougal, D Rempel, Alan, W Gimbert, Florent |
author_facet |
Lipovsky, Bradley Paul Meyer, Colin, R Zoet, Lucas, K Mccarthy, Christine Hansen, Dougal, D Rempel, Alan, W Gimbert, Florent |
author_sort |
Lipovsky, Bradley Paul |
title |
Glacier sliding, seismicity and sediment entrainment |
title_short |
Glacier sliding, seismicity and sediment entrainment |
title_full |
Glacier sliding, seismicity and sediment entrainment |
title_fullStr |
Glacier sliding, seismicity and sediment entrainment |
title_full_unstemmed |
Glacier sliding, seismicity and sediment entrainment |
title_sort |
glacier sliding, seismicity and sediment entrainment |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02395973 https://hal.science/hal-02395973/document https://hal.science/hal-02395973/file/Lipovsky2019.pdf https://doi.org/10.1017/aog.2019.24 |
long_lat |
ENVELOPE(-64.250,-64.250,-84.450,-84.450) ENVELOPE(-145.000,-145.000,-83.667,-83.667) |
geographic |
West Antarctica Whillans Whillans Ice Stream |
geographic_facet |
West Antarctica Whillans Whillans Ice Stream |
genre |
Annals of Glaciology Antarc* Antarctica West Antarctica Whillans Ice Stream |
genre_facet |
Annals of Glaciology Antarc* Antarctica West Antarctica Whillans Ice Stream |
op_source |
ISSN: 0260-3055 EISSN: 1727-5644 Annals of Glaciology https://hal.science/hal-02395973 Annals of Glaciology, 2019, 60 (79), pp.182-192. ⟨10.1017/aog.2019.24⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/aog.2019.24 hal-02395973 https://hal.science/hal-02395973 https://hal.science/hal-02395973/document https://hal.science/hal-02395973/file/Lipovsky2019.pdf doi:10.1017/aog.2019.24 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1017/aog.2019.24 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
182 |
op_container_end_page |
192 |
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1798840790953230336 |