The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy

Abstract : Rock avalanching is a very hazardous process in high mountain area. Present climatically induced glacier shrinkage and permafrost degradation could increase its frequency and magnitude. A 0.5 M m3 rock avalanche affected the 400-m-high North face of Mont Crammont (western Italian Alps) on 24/12/ 2008. The main part of the rock mass settled at the rockwall foot, whereas a minor part travelled horizontal and vertical distances of 3,050 and 1,560 m, respectively. The mobility was enhanced by the channelization in two torrent gullies, and the incorporation of snow. Three elements suggest that the rock avalanche could have been triggered by the current degradation of the rockwall permafrost: seepage water in the detachment zone; modelled 'warm' permafrost (T > −2 °C); no other Holocene rock avalanche deposit. Collapsed volume was computed by comparison of pre- and post-event DTMs. Back analysis calculation of the rock avalanche runout suggests a two step event
Type de document :
Communication dans un congrès
2nd World landslide Forum, 2011, Rome, Italy. pp. 403-408, 2011
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https://hal.archives-ouvertes.fr/halsde-00873375
Contributeur : Christine Maury <>
Soumis le : mardi 15 octobre 2013 - 15:27:31
Dernière modification le : jeudi 11 janvier 2018 - 06:20:38

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  • HAL Id : halsde-00873375, version 1

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Philip Deline, Massimo Broccolato, Jeannette Noetzli, Ludovic Ravanel, Andrea Tamburini. The December 2008 Crammont rock avalanche, Mont Blanc massif area, Italy. 2nd World landslide Forum, 2011, Rome, Italy. pp. 403-408, 2011. 〈halsde-00873375〉

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