The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy
International audience We describe a 0.5 Mm3 rock avalanche that occurred in 2008 in the western Alps and discuss possible roles of controlling factors in the context of current climate change. The source is located between 2410 m and 2653 m a.s.l. on Mont Crammont and is controlled by a densely fra...
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Online Access: | https://hal.science/halsde-00653747 https://doi.org/10.5194/nhess-11-3307-2011 |
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ftunigrenoble:oai:HAL:halsde-00653747v1 2024-05-12T08:09:53+00:00 The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy Deline, Philip Alberto, W. Broccolato, Massimo Hunger, Oldrich Noetzli, Jeannette Ravanel, Ludovic Tamburini, Andrea Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Servizio Geologico della Regione Autonoma Valle d'Aosta Administration Régionale de la vallée d'Aoste Department of Earth and Ocean Sciences Vancouver (EOS) University of British Columbia (UBC) Glaciology Geomorphodynamics & Geochronology 2011 https://hal.science/halsde-00653747 https://doi.org/10.5194/nhess-11-3307-2011 en eng HAL CCSD Copernicus Publ. / European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/nhess-11-3307-2011 halsde-00653747 https://hal.science/halsde-00653747 doi:10.5194/nhess-11-3307-2011 ISSN: 1561-8633 EISSN: 1684-9981 Natural Hazards and Earth System Sciences https://hal.science/halsde-00653747 Natural Hazards and Earth System Sciences, 2011, en ligne : http://www.nat-hazards-earth-syst-sci.net/11/3307/2011/nhess-11-3307-2011.html. ⟨10.5194/nhess-11-3307-2011⟩ info:eu-repo/semantics/article Journal articles 2011 ftunigrenoble https://doi.org/10.5194/nhess-11-3307-2011 2024-04-18T02:25:25Z International audience We describe a 0.5 Mm3 rock avalanche that occurred in 2008 in the western Alps and discuss possible roles of controlling factors in the context of current climate change. The source is located between 2410 m and 2653 m a.s.l. on Mont Crammont and is controlled by a densely fractured rock structure. The main part of the collapsed rock mass deposited at the foot of the rock wall. A smaller part travelled much farther, reaching horizontal and vertical travel distances of 3050 m and 1560 m, respectively. The mobility of the rock mass was enhanced by channelization and snow. The rock-avalanche volume was calculated by comparison of pre- and post-event DTMs, and geomechanical characterization of the detachment zone was extracted from LiDAR point cloud processing. Back analysis of the rock-avalanche runout suggests a two stage event. There was no previous rock avalanche activity from the Mont Crammont ridge during the Holocene. The 2008 rock avalanche may have resulted from permafrost degradation in the steep rock wall, as suggested by seepage water in the scar after the collapse in spite of negative air temperatures, and modelling of rock temperatures that indicate warm permafrost (T > −2 °C). Article in Journal/Newspaper permafrost Université Grenoble Alpes: HAL Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Natural Hazards and Earth System Sciences 11 12 3307 3318 |
institution |
Open Polar |
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Université Grenoble Alpes: HAL |
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ftunigrenoble |
language |
English |
description |
International audience We describe a 0.5 Mm3 rock avalanche that occurred in 2008 in the western Alps and discuss possible roles of controlling factors in the context of current climate change. The source is located between 2410 m and 2653 m a.s.l. on Mont Crammont and is controlled by a densely fractured rock structure. The main part of the collapsed rock mass deposited at the foot of the rock wall. A smaller part travelled much farther, reaching horizontal and vertical travel distances of 3050 m and 1560 m, respectively. The mobility of the rock mass was enhanced by channelization and snow. The rock-avalanche volume was calculated by comparison of pre- and post-event DTMs, and geomechanical characterization of the detachment zone was extracted from LiDAR point cloud processing. Back analysis of the rock-avalanche runout suggests a two stage event. There was no previous rock avalanche activity from the Mont Crammont ridge during the Holocene. The 2008 rock avalanche may have resulted from permafrost degradation in the steep rock wall, as suggested by seepage water in the scar after the collapse in spite of negative air temperatures, and modelling of rock temperatures that indicate warm permafrost (T > −2 °C). |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Servizio Geologico della Regione Autonoma Valle d'Aosta Administration Régionale de la vallée d'Aoste Department of Earth and Ocean Sciences Vancouver (EOS) University of British Columbia (UBC) Glaciology Geomorphodynamics & Geochronology |
format |
Article in Journal/Newspaper |
author |
Deline, Philip Alberto, W. Broccolato, Massimo Hunger, Oldrich Noetzli, Jeannette Ravanel, Ludovic Tamburini, Andrea |
spellingShingle |
Deline, Philip Alberto, W. Broccolato, Massimo Hunger, Oldrich Noetzli, Jeannette Ravanel, Ludovic Tamburini, Andrea The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy |
author_facet |
Deline, Philip Alberto, W. Broccolato, Massimo Hunger, Oldrich Noetzli, Jeannette Ravanel, Ludovic Tamburini, Andrea |
author_sort |
Deline, Philip |
title |
The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy |
title_short |
The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy |
title_full |
The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy |
title_fullStr |
The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy |
title_full_unstemmed |
The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy |
title_sort |
december 2008 crammont rock avalanche, mont blanc massif area, italy |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/halsde-00653747 https://doi.org/10.5194/nhess-11-3307-2011 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Mont Blanc |
geographic_facet |
Mont Blanc |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
ISSN: 1561-8633 EISSN: 1684-9981 Natural Hazards and Earth System Sciences https://hal.science/halsde-00653747 Natural Hazards and Earth System Sciences, 2011, en ligne : http://www.nat-hazards-earth-syst-sci.net/11/3307/2011/nhess-11-3307-2011.html. ⟨10.5194/nhess-11-3307-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/nhess-11-3307-2011 halsde-00653747 https://hal.science/halsde-00653747 doi:10.5194/nhess-11-3307-2011 |
op_doi |
https://doi.org/10.5194/nhess-11-3307-2011 |
container_title |
Natural Hazards and Earth System Sciences |
container_volume |
11 |
container_issue |
12 |
container_start_page |
3307 |
op_container_end_page |
3318 |
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1798853238223536128 |