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• W4383217180 startingPage "94" @default.
• W4383217180 abstract "Despite numerous studies on Himalayan erosion, it is not known how the very high Himalayan peaks erode. Although valley floors are efficiently eroded by glaciers, the intensity of periglacial processes, which erode the headwalls extending from glacial cirques to crest lines, seems to decrease sharply with altitude1,2. This contrast suggests that erosion is muted and much lower than regional rock uplift rates for the highest Himalayan peaks, raising questions about their long-term evolution3,4. Here we report geological evidence for a giant rockslide that occurred around 1190 ad in the Annapurna massif (central Nepal), involving a total rock volume of about 23 km3. This event collapsed a palaeo-summit, probably culminating above 8,000 m in altitude. Our data suggest that a mode of high-altitude erosion could be mega-rockslides, leading to the sudden reduction of ridge-crest elevation by several hundred metres and ultimately preventing the disproportionate growth of the Himalayan peaks. This erosion mode, associated with steep slopes and high relief, arises from a greater mechanical strength of the peak substratum, probably because of the presence of permafrost at high altitude. Giant rockslides also have implications for landscape evolution and natural hazards: the massive supply of finely crushed sediments can fill valleys more than 150 km farther downstream and overwhelm the sediment load in Himalayan rivers for a century or more. Observations and samples from the central Himalayas show that a giant rockslide occurring around 1190 ad in the Annapurna massif led to the collapse of an elevated palaeo-summit, illustrating the episodic mode of erosion of the glaciated high relief by mega-rockslides." @default.
• W4383217180 created "2023-07-06" @default.
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• W4383217180 date "2023-07-05" @default.
• W4383217180 modified "2023-10-08" @default.
• W4383217180 title "Medieval demise of a Himalayan giant summit induced by mega-landslide" @default.
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• W4383217180 doi "https://doi.org/10.1038/s41586-023-06040-5" @default.
• W4383217180 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37407683" @default.
• W4383217180 hasPublicationYear "2023" @default.
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