Implications of geomorphological research for recent and prehistoric avalanches and related hazards at Huascaran,Peru |
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| Authors: | Jan Klime? Vít Vilímek Marek Omelka |
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| Institution: | (1) Institute of Rock Structures and Mechanics, Academy of Sciences, Prague, Czech Republic;(2) Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Prague, Czech Republic;(3) Jaroslav Hajek Center for Theoretical and Applied Statistics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic |
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| Abstract: | Detailed research of superficial deposits below the northern peak of Huascaran (Cordillera Blanca) provides new information
on the limits of a paleo-avalanche originating from this mountain. Geomorphological mapping of the sediments identified glacial
deposits, deposits from historical rock-debris avalanches and huge boulders from a paleo-avalanche. Schmidt Hammer rock-hardness
tests were used to distinguish between the several generations of rock-debris avalanches, but largely failed to distinguish
between the much older moraine and the paleo-avalanche sediments. Thus, only the field geomorphological mapping proved to
be reliable for identifying the limits of the paleo-avalanche. The limits identified as granite boulders deposited over volcanic
rocks were found to extend 30 m further up the opposite valley slope than previously had been mapped. This larger extent implies
a greater volume and/or greater mobility for the prehistoric event. |
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| Keywords: | Slope movements Natural hazards Schmidt Hammer tests Huascaran Cordillera Blanca Peru |
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