CATASTROPHIC VOLCANIC LANDSLIDES: THE LA OROTAVA EVENTS ON TENERIFE, CANARY ISLANDS

  • M. HÜRLIMANN
  • A. LEDESMA
Conference paper
Part of the NATO Science Series book series (NAIV, volume 49)

Abstract

Giant volcanic landslides are one of the most hazardous geological processes. On Tenerife, seven large landslides affected the subaerial and submarine morphology during the last ∼6 Ma. A comprehensive analysis of the La Orotava events was carried out including site investigation, laboratory tests and stability analyses. The results revealed that the stability of the volcano can be strongly reduced by geologic, morphologic, climatic and volcanological factors. Widespread residual soils might act as potential slip surfaces, while deep erosive canyons probably evolve into the lateral limits of the failures. A high coastal cliff, humid climate and especially persistent dike intrusion contributed to critical stability conditions. Finally, seismic ground acceleration generated by a strong and adjacent tremor triggered the landslides. On Tenerife, a temporal coincidence of large landslides with caldera collapse events suggests that strong earthquakes associated with caldera collapses may have triggered the failures.

Keywords

Canary Island Triaxial Test Limit Equilibrium Method Large Landslide Pore Fluid Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2006

Authors and Affiliations

  • M. HÜRLIMANN
    • 1
  • A. LEDESMA
    • 1
  1. 1.Department of Geotechnical Engineering and GeosciencesTechnical University of Catalonia (UPC)BarcelonaSpain

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