Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved
International audience Paraglaciation has often been considered as a main predisposing factor in landslide occurrence; its consequences have been particularly well identified at a fine scale (especially on bedrock jointing). However, the impacts of paraglaciation on hillslope dynamics at a regional...
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ftccsdartic:oai:HAL:hal-00859837v1 2023-05-15T16:47:04+02:00 Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved Cossart, Etienne Mercier, Denis Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn Pôle de recherche pour l'organisation et la diffusion de l'information géographique (PRODIG) Université Paris 1 Panthéon-Sorbonne (UP1)-Institut de Recherche pour le Développement (IRD)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris-Sorbonne (UP4)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Náttúrustofa Norðurlands vestra (NNv) Ríkisins, Sveitafélag Skagafjarðar Paris, France 2013-08-27 https://hal.archives-ouvertes.fr/hal-00859837 en eng HAL CCSD hal-00859837 https://hal.archives-ouvertes.fr/hal-00859837 Geomorphology and Sustainability, 8th IAG International Conference on Geomorphology https://hal.archives-ouvertes.fr/hal-00859837 Geomorphology and Sustainability, 8th IAG International Conference on Geomorphology, Aug 2013, Paris, France. p. 628 Geomorphology paraglacial Iceland glacio-isostatic rebound [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology info:eu-repo/semantics/conferenceObject Conference papers 2013 ftccsdartic 2021-12-26T00:20:50Z International audience Paraglaciation has often been considered as a main predisposing factor in landslide occurrence; its consequences have been particularly well identified at a fine scale (especially on bedrock jointing). However, the impacts of paraglaciation on hillslope dynamics at a regional scale have never been discussed. We focus here on the Skagafjörður area (Northern Iceland) to compare the role of paraglaciation with that of classic factors (topography, lithology etc.) in landslide occurrence, using a spatial analysis (based upon a chi-square test). The results highlight that landslides are over-represented in areas where post-glacial rebound was at its maximum (i.e. there is a concentration of landslides in the northern part), which fits well with the first chronological benchmark we obtained. Thus, landslides occurred during the first half of the Holocene, when the post-glacial uplift was at its maximum. Finally, the mechanisms that link post-glacial rebound and landsliding are discussed. On the one hand, post-glacial rebound is identified as an efficient process to generate slope instabilities, leading to a concentration of landslides in the northern part of the fjord. On the other hand, the expected role of glacial debuttressing cannot be demonstrated here, although it is often considered one of the most important paraglacial influences on landsliding. Conference Object Iceland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Skagafjörður ENVELOPE(-19.561,-19.561,65.875,65.875) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Geomorphology paraglacial Iceland glacio-isostatic rebound [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
spellingShingle |
Geomorphology paraglacial Iceland glacio-isostatic rebound [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Cossart, Etienne Mercier, Denis Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved |
topic_facet |
Geomorphology paraglacial Iceland glacio-isostatic rebound [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
description |
International audience Paraglaciation has often been considered as a main predisposing factor in landslide occurrence; its consequences have been particularly well identified at a fine scale (especially on bedrock jointing). However, the impacts of paraglaciation on hillslope dynamics at a regional scale have never been discussed. We focus here on the Skagafjörður area (Northern Iceland) to compare the role of paraglaciation with that of classic factors (topography, lithology etc.) in landslide occurrence, using a spatial analysis (based upon a chi-square test). The results highlight that landslides are over-represented in areas where post-glacial rebound was at its maximum (i.e. there is a concentration of landslides in the northern part), which fits well with the first chronological benchmark we obtained. Thus, landslides occurred during the first half of the Holocene, when the post-glacial uplift was at its maximum. Finally, the mechanisms that link post-glacial rebound and landsliding are discussed. On the one hand, post-glacial rebound is identified as an efficient process to generate slope instabilities, leading to a concentration of landslides in the northern part of the fjord. On the other hand, the expected role of glacial debuttressing cannot be demonstrated here, although it is often considered one of the most important paraglacial influences on landsliding. |
author2 |
Pôle de recherche pour l'organisation et la diffusion de l'information géographique (PRODIG) Université Paris 1 Panthéon-Sorbonne (UP1)-Institut de Recherche pour le Développement (IRD)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris-Sorbonne (UP4)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Náttúrustofa Norðurlands vestra (NNv) Ríkisins, Sveitafélag Skagafjarðar |
format |
Conference Object |
author |
Cossart, Etienne Mercier, Denis Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn |
author_facet |
Cossart, Etienne Mercier, Denis Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn |
author_sort |
Cossart, Etienne |
title |
Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved |
title_short |
Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved |
title_full |
Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved |
title_fullStr |
Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved |
title_full_unstemmed |
Impacts of post glacial rebound on landsliding at a regional scale in Northern Iceland (Skagafjörður): spatial distribution and mechanisms involved |
title_sort |
impacts of post glacial rebound on landsliding at a regional scale in northern iceland (skagafjörður): spatial distribution and mechanisms involved |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.archives-ouvertes.fr/hal-00859837 |
op_coverage |
Paris, France |
long_lat |
ENVELOPE(-19.561,-19.561,65.875,65.875) |
geographic |
Skagafjörður |
geographic_facet |
Skagafjörður |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geomorphology and Sustainability, 8th IAG International Conference on Geomorphology https://hal.archives-ouvertes.fr/hal-00859837 Geomorphology and Sustainability, 8th IAG International Conference on Geomorphology, Aug 2013, Paris, France. p. 628 |
op_relation |
hal-00859837 https://hal.archives-ouvertes.fr/hal-00859837 |
_version_ |
1766037160542076928 |