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Implications of geomorphological research for recent and prehistoric avalanches and related hazards at Huascaran, Peru

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  • Jan Klimeš
  • Vít Vilímek
  • Marek Omelka

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. Copyright Springer Science+Business Media B.V. 2009

Suggested Citation

  • Jan Klimeš & Vít Vilímek & Marek Omelka, 2009. "Implications of geomorphological research for recent and prehistoric avalanches and related hazards at Huascaran, Peru," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 50(1), pages 193-209, July.
    • Handle: RePEc:spr:nathaz:v:50:y:2009:i:1:p:193-209
    DOI: 10.1007/s11069-008-9330-7
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