A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics
Submarine landslides are common at glaciated continental margins. The onset of large-scale landslides coincides with the initiation of Northern Hemisphere glaciations in the Quaternary. This implies that processes related to glacial cycling provide favourable conditions for submarine landslides at h...
Published in: | Geological Society, London, Special Publications |
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2020
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Online Access: | https://oceanrep.geomar.de/id/eprint/48620/ https://oceanrep.geomar.de/id/eprint/48620/7/Urlaub.pdf https://doi.org/10.1144/SP500-2019-185 |
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ftoceanrep:oai:oceanrep.geomar.de:48620 2023-05-15T16:40:32+02:00 A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics Urlaub, Morelia Kratzke, Isabel Hjelstuen, Berit Oline Georgiopoulou, A. 2020-03-13 text https://oceanrep.geomar.de/id/eprint/48620/ https://oceanrep.geomar.de/id/eprint/48620/7/Urlaub.pdf https://doi.org/10.1144/SP500-2019-185 en eng GSL (Geological Society of London) https://oceanrep.geomar.de/id/eprint/48620/7/Urlaub.pdf Urlaub, M. , Kratzke, I. and Hjelstuen, B. O. (2020) A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics. In: Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard. , ed. by Georgiopoulou, A. Special Publications Geological Society London, 500 . GSL (Geological Society of London), London, pp. 255-266. DOI 10.1144/SP500-2019-185 <https://doi.org/10.1144/SP500-2019-185>. doi:10.1144/SP500-2019-185 info:eu-repo/semantics/restrictedAccess Book chapter NonPeerReviewed 2020 ftoceanrep https://doi.org/10.1144/SP500-2019-185 2023-04-07T15:48:48Z Submarine landslides are common at glaciated continental margins. The onset of large-scale landslides coincides with the initiation of Northern Hemisphere glaciations in the Quaternary. This implies that processes related to glacial cycling provide favourable conditions for submarine landslides at high-latitude margins. Potential processes include glacial deposition patterns and enhanced seismicity. It is also possible that advances and retreats of ice sheets, a highly dynamic process in geologic terms, makes slopes discernible to failure by modifying the stress regime. Here, we quantify this effect using 2D Finite Element modelling of a glaciated continental margin. Different model runs investigate the pore pressure development in homogeneous as well as layered slopes during glaciation when loaded by an ice stream with one or multiple ice advances. Ice streams cause significant variations in excess pore pressure in the very shallow sediment sequences at the continental shelf. However, lateral fluid flow is not efficient enough to increase pore pressures significantly at the slope, where large-scale submarine slides are observed. Hence, while ice sheet dynamics appear to favour the occurrence of shallow slides close to the shelf edge, ice sheets seem to be irrelevant for the generation of large-scale submarine landslides at the continental slope. Book Part Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Geological Society, London, Special Publications 500 1 255 266 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Submarine landslides are common at glaciated continental margins. The onset of large-scale landslides coincides with the initiation of Northern Hemisphere glaciations in the Quaternary. This implies that processes related to glacial cycling provide favourable conditions for submarine landslides at high-latitude margins. Potential processes include glacial deposition patterns and enhanced seismicity. It is also possible that advances and retreats of ice sheets, a highly dynamic process in geologic terms, makes slopes discernible to failure by modifying the stress regime. Here, we quantify this effect using 2D Finite Element modelling of a glaciated continental margin. Different model runs investigate the pore pressure development in homogeneous as well as layered slopes during glaciation when loaded by an ice stream with one or multiple ice advances. Ice streams cause significant variations in excess pore pressure in the very shallow sediment sequences at the continental shelf. However, lateral fluid flow is not efficient enough to increase pore pressures significantly at the slope, where large-scale submarine slides are observed. Hence, while ice sheet dynamics appear to favour the occurrence of shallow slides close to the shelf edge, ice sheets seem to be irrelevant for the generation of large-scale submarine landslides at the continental slope. |
author2 |
Georgiopoulou, A. |
format |
Book Part |
author |
Urlaub, Morelia Kratzke, Isabel Hjelstuen, Berit Oline |
spellingShingle |
Urlaub, Morelia Kratzke, Isabel Hjelstuen, Berit Oline A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
author_facet |
Urlaub, Morelia Kratzke, Isabel Hjelstuen, Berit Oline |
author_sort |
Urlaub, Morelia |
title |
A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
title_short |
A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
title_full |
A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
title_fullStr |
A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
title_full_unstemmed |
A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
title_sort |
numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics |
publisher |
GSL (Geological Society of London) |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/48620/ https://oceanrep.geomar.de/id/eprint/48620/7/Urlaub.pdf https://doi.org/10.1144/SP500-2019-185 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://oceanrep.geomar.de/id/eprint/48620/7/Urlaub.pdf Urlaub, M. , Kratzke, I. and Hjelstuen, B. O. (2020) A numerical investigation of excess pore pressures and continental slope stability in response to ice sheet dynamics. In: Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard. , ed. by Georgiopoulou, A. Special Publications Geological Society London, 500 . GSL (Geological Society of London), London, pp. 255-266. DOI 10.1144/SP500-2019-185 <https://doi.org/10.1144/SP500-2019-185>. doi:10.1144/SP500-2019-185 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1144/SP500-2019-185 |
container_title |
Geological Society, London, Special Publications |
container_volume |
500 |
container_issue |
1 |
container_start_page |
255 |
op_container_end_page |
266 |
_version_ |
1766030939423506432 |