the december 2008 crammont rock avalanche, mont blanc massif area, italy
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2011
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Abstract
We describe a 0.5 Mm<sup>3</sup> 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. <br><br> 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 (<i>T</i> > −2 °C).
| Reference Key |
deline2011naturalthe
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| Authors | ;P. Deline;W. Alberto;M. Broccolato;O. Hungr;J. Noetzli;L. Ravanel;A. Tamburini |
| Journal | anziam journal |
| Year | 2011 |
| DOI |
10.5194/nhess-11-3307-2011
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