Mapping release and propagation areas of permafrost-related rock slope failures to identify hot spots for hazard assessment, French Alps ...

• Main Authors: Cathala, Maëva, Magnin, Florence, Ravanel, Ludovic, Dorren, Luuk, Zuanon, Nicolas, Berger, Frédéric, Bourrier, Franck, Deline, Philip
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Mont Blanc; permafrost
• Online Access: https://dx.doi.org/10.57757/iugg23-1859; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017750

<!--!introduction!--> Permafrost-affected rockwalls are increasingly impacted by the effects of climate change and rising air temperature leading to rock slope failures. These events could be a threat for human lives and infrastructure, which underlines the need of better knowledge about their triggering mechanism and propagation. The aim of this study was to propose a regional mapping approach of susceptible release areas of rock slope failures and resulting runout distances. This information is a first step to identify hotspots for subsequent hazard assessment. To do so, we used an inventory of 1389 rock slope failures (volume > 10 2 m 3 ) recorded in the Mont-Blanc massif on 2007-2019 period and determined the topographical and permafrost conditions that are most prone to their triggering using a digital terrain model and a permafrost map. These conditions are used in a multi-criteria GIS approach to identify potential unstable slopes at the French Alps scale. Then, the potential release area map ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...