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2015 ; 6
(ä): 7964
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Rapid sequestration of rock avalanche deposits within glaciers
#MMPMID26286361
Dunning SA
; Rosser NJ
; McColl ST
; Reznichenko NV
Nat Commun
2015[Aug]; 6
(ä): 7964
PMID26286361
show ga
Topographic development in mountainous landscapes is a complex interplay between
tectonics, climate and denudation. Glaciers erode valleys to generate headwall
relief, and hillslope processes control the height and retreat of the peaks. The
magnitude-frequency of these landslides and their long-term ability to lower
mountains above glaciers is poorly understood; however, small, frequent rockfalls
are currently thought to dominate. The preservation of rarer, larger, landslide
deposits is exceptionally short-lived, as they are rapidly reworked. The 2013
Mount Haast rock avalanche that failed from the slopes of Aoraki/Mount Cook, New
Zealand, onto the glacier accumulation zone below was invisible to conventional
remote sensing after just 3 months. Here we use sub-surface data to reveal the
now-buried landslide deposit, and suggest that large landslides are the primary
hillslope erosion mechanism here. These data show how past large landslides can
be identified in accumulation zones, providing an untapped archive of erosive
events in mountainous landscapes.