Journal
CANADIAN GEOTECHNICAL JOURNAL
Volume 48, Issue 1, Pages 128-145Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/T10-059
Keywords
landslides; hazard mapping; index-based method; geographical information system (GIS); Wenchuan earthquake; Beichuan area
Funding
- 973 Program [2008CB425801]
- National Foundation for Natural Science of China [40772206]
- State Key Laboratory of Geo-Hazard Prevention [SKLGP2009Z004]
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The Wenchuan earthquake (magnitude Ms = 8.0) of 12 May 2008 triggered widespread and large-scale landslides over an area of about 50 000 km(2). A study was undertaken to determine the primary factors associated with seismic landslide occurrence. An index-based approach used to assess earthquake-triggered landslide hazard in the central part of the Wenchuan earthquake area affected is described. Slope gradient, relief amplitude, lithology, bedding-slope relations, fault proximity, stream proximity, and antecedent rainfall are recognized as factors that may have had an important influence on landslide occurrence. The assessment of the influence of each of these factors is presented through use of a series of maps showing areas of low, moderate, high, and very high landslide hazard. Areas identified as having very high and high landslide hazard were located along the earthquake-source fault and along both banks of the Jian River. The role of rainfall is very significant for future landslide occurrence in the earthquake area. The results of this study will assist decision makers in the selection of safe sites during the reconstruction process. The maps can also be used for landslide risk management in the study area.
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