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Susceptibility of coastal landslides and related hazards in the Chilean Patagonia: The case of Hornopirén area (42ºS)

Authors

  • Sergio A. Sepúlveda Departamento de Geología, Universidad de Chile
  • Verónica Náquira Departamento de Geología, Universidad de Chile - Arcadis Chile
  • Manuel Arenas SERNAGEOMIN
No. 43 (2011)
https://doi.org/10.5354/0719-5370.2011.18496

Abstract

Coastal landslides can be a significant source of risk in fjord environments, with the potential of causing direct damage to local settlements as well as indirect damage by generation of destructive local tsunamis. Different types of landslides can be triggered either by intense rainfall or seismic activity, as it happened in the Aysén fjord in Southern Chile during the 2007 earthquake in the Liquiñe-Ofqui Fault Zone (LOFZ). In this paper we analyze the fjordland around the coastal town of Hornopirén, located along the trace of the LOFZ, using a bivariate statistical method to assess the landslide susceptibility. The results show an important degree of susceptibility to landsliding in the fjordland area around Hornopirén. This is a matter of concern for the town, the largest in the area and key for the connectivity to the Patagonia, which is potentially vulnerable to tsunamis waves that can be induced by coastal landslides. A detailed landslide-induced tsunamis hazard and risk study is highly recommended to address this potentially disastrous issue.    

Keywords:

Landslide, fjord, hazard, geological risk, tsunami

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How to Cite
Sepúlveda, S. A., Náquira, V., & Arenas, M. (2011). Susceptibility of coastal landslides and related hazards in the Chilean Patagonia: The case of Hornopirén area (42ºS). Investigaciones Geográficas, (43), Pág. 35–46. https://doi.org/10.5354/0719-5370.2011.18496
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Investigaciones Geográficas
Facultad de Arquitectura y Urbanismo
Universidad de Chile
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