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The Cerro Caquilluco–Cerrillos Negros Giant Rock Avalanches (Tacna, Peru)

  • Giovanni B. CrostaEmail author
  • Frattini Paolo
  • Valbuzzi Elena
  • Reginald L. Hermanns
Conference paper

Abstract

Giant rock avalanches have been recognized and mapped in southern Peru, to the N of Tacna. The Cerro Caquilluco rock avalanche complex has a total volume of about 15 km3 and a length of 43 km, extending from 3,900 to 530 m a.s.l.. Mapping the internal structures, the scar features and the depositional lobes allowed to suggest that the rock avalanche complex developed as a sequence of successive failures affecting tuffaceous and conglomeratic formations forming a gently dipping monoclinalic slope. Assessment of lobes volume constrained the reconstruction of the source areas for the multiple failures and the successive rock avalanche simulations. Seismic triggering is suggested, whereas H/L vs volume relationships suggest a high mobility comparable to that of extremely mobile volcanic rock avalanches.

Keywords

Rock avalanche Failure sequence 3D runout simulation Peru 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Giovanni B. Crosta
    • 1
    Email author
  • Frattini Paolo
    • 1
  • Valbuzzi Elena
    • 1
  • Reginald L. Hermanns
    • 2
  1. 1.Department of Earth and Environmental SciencesUniversity of Milano-BicoccaMilanItaly
  2. 2.Norwegian Geological Survey (NGU)TrondheimNorway

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