A methodological approach for the analysis of the temporal occurrence and triggering factors of landslides

A methodological approach for the analysis of the temporal occurrence and triggering factors of... The temporal occurrence of landslides in an area of the Cantabrian Range during the last 120,000 years is analyzed. An initial relative chronology was established on the basis of aging degree and spatial relationships between landslides and glacial and fluvial features. Ten landslide classes were thus identified and their chronological limits defined on the basis of 19 14 C age determinations on fluvial and glacial deposits (including eight new ones). The chronology was tested with 14 C dates obtained on landslide deposits, 10 from previous work and nine new ones. The chronological classes identified were compared with existing climate models for the region; the type and spatial distribution of landslides in each class were also analyzed. The approach made it possible to identify periods during which landslides were triggered mainly by channel incision, seismic activity and rainfall increase. Human activity played a significant role after 5000 BP and especially in the last few centuries. Mobilization of materials by slope movements has increased in the region by a factor of 10, compared to pre-Neolithic rates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geomorphology Elsevier

A methodological approach for the analysis of the temporal occurrence and triggering factors of landslides

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Abstract

The temporal occurrence of landslides in an area of the Cantabrian Range during the last 120,000 years is analyzed. An initial relative chronology was established on the basis of aging degree and spatial relationships between landslides and glacial and fluvial features. Ten landslide classes were thus identified and their chronological limits defined on the basis of 19 14 C age determinations on fluvial and glacial deposits (including eight new ones). The chronology was tested with 14 C dates obtained on landslide deposits, 10 from previous work and nine new ones. The chronological classes identified were compared with existing climate models for the region; the type and spatial distribution of landslides in each class were also analyzed. The approach made it possible to identify periods during which landslides were triggered mainly by channel incision, seismic activity and rainfall increase. Human activity played a significant role after 5000 BP and especially in the last few centuries. Mobilization of materials by slope movements has increased in the region by a factor of 10, compared to pre-Neolithic rates.

Journal

GeomorphologyElsevier

Published: Oct 1, 1999

References

  • Quaternary evolution of a meandering gravel bed river in Central Spain
    Alonso, A.; Garzón, G.
  • The contribution of landslides to landscape evolution in Europe
    Cendrero, A.; Dramis, F.
  • Late Quaternary climate changes and mass movement frequency and magnitude in the Cantabrian region, Spain
    González-Dı́ez, A.; Salas, L.; Dı́az de Terán, J.R.; Cendrero, A.
  • Holocene lake-level fluctuations in Jura and the northern subalpine ranges, France: regional pattern and climatic implications
    Magny, M.
  • Younger Dryas and early Holocene lake-level fluctuations in the Jura Mountains, France
    Magny, M.; Ruffaldi, P.

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