TY  - JOUR
PY  - 2010//
TI  - Rock falls in the Mont Blanc Massif in 2007 and 2008
JO  - Landslides
A1  - Ravanel, Ludovic
A1  - Allignol, Françoise
A1  - Deline, Philip
A1  - Gruber, Stephan
A1  - Ravello, Mario
SP  - 493
EP  - 501
VL  - 7
IS  - 4
N2  - Due to a lack of systematic observations, the intensity and volume of rock falls and rock avalanches in high mountain areas are still poorly known. Nevertheless, these phenomena could have burly consequences. To document present rock falls, a network of observers (guides, mountaineers, and hut wardens) was initiated in the Mont Blanc Massif in 2005 and became fully operational in 2007. This article presents data on the 66 rock falls (100 m 3 ≤ V ≤ 50,000 m 3 ) documented in 2007 ( n = 41) and 2008 ( n = 25). Most of the starting zones are located in warm permafrost areas, which are most sensitive to warming, and only four rock falls are clearly out of permafrost area. Different elements support permafrost degradation as one of the main triggering factors of present rock falls in high mountain areas.<p /> 
LA  - 
SN  - 1612-510X
UR  - http://dx.doi.org/10.1007/s10346-010-0206-z
ID  - ref1
ER  -