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- W8554074 abstract "Two catastrophic avalanches in 1970 and 1962, and one even larger pre-Columbian avalanche, originated from Nevados Huascarán, the highest peak in the Peruvian Andes. The most recent avalanche, which was earthquake-triggered, had a volume on the order of 50–100 × 106 m3 and caused an estimated 18,000 casualties, mainly in the city of Yungay. The 1962 avalanche, with an approximate volume of 13 × 106 m3 killed about 4000 people, mostly in the city of Ranrahirca. Prior to 1962, there were no major avalanches from Nevados Huascarán since the arrival of the Spaniards in the early 16th century, but there is clear geologic evidence that the historic avalanches occurred within an area covered by debris from an enormous pre-Columbian avalanche. Fissuring of the ice cap on Nevados Huascarán above the avalanche source area suggests that the peak remains unstable despite two recent avalanches and that a significant avalanche hazard remains with respect to communities in the valley below. The avalanches originated from between 5400 and 6500 m elevation on the west face of the north peak of Nevados Huascarán and traveled 16 km to the Rio Santa (altitude about 2400 m) at velocities that averaged about 280 km/ hr in 1970, 170 km/hr in 1962, and possibly 315–355 km/hr for the pre-Columbian event. At their lower ends the two historic avalanches graded into debris flows that continued down the Rio Santa at decreased velocity where they caused extensive additional destruction. The large horizontal runout of the debris and the associated extreme velocities of the three avalanches appear to be related primarily to their fluidity and extreme height of fall. The fluidity results from entrainment in the debris of large volumes of snow and meltwater derived from Glacier 511 immediately below the source area. During the 1970 event, some of the debris was accelerated to velocities on the order of 1000 km/hr, velocities that are in excess of what would be expected for a purely gravitational fall. Such abnormally high velocities are suggested by the combination of excessive distances to which boulders weighing several tons were hurled through the air (up to 4 km), the relationship between missile mass and impact crater size, and spattering of mud far beyond the limits of the avalanche on trajectories that appear to be inclined downward at low angles to the horizontal." @default.
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- W8554074 date "1978-01-01" @default.
- W8554074 modified "2023-10-05" @default.
- W8554074 title "Nevados Huascarán Avalanches, Peru" @default.
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- W8554074 doi "https://doi.org/10.1016/b978-0-444-41507-3.50016-7" @default.
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