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| Susceptibility mapping of landslides and debris flows in 2008 Wenchuan earthquake by using cluster analysis and maximum likelihood classification methods |
| Hu Kaiheng, Cui Peng, Han Yongshun, You Yong |
| Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences； Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy：Chengdu, 610041, China |
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Abstract Cluster analysis and Maximum Likelihood Classification (MLC) methods are introduced to map the susceptibility of post-quake geo-hazards in the Ms 8.0 Wenchuan earthquake area. Four variables including slope gradient, relative relief, seismic intensity and surface runoff are chosen as predominant factors of the susceptibility mapping. The mapping result shows that this approach has the advantage of rapid evaluation, and is applicable even when there is short of training data. Five kinds of susceptibility (very low, low, moderate, high, and extreme high) are assigned to the study area by virtue of expert experience and geo-hazard density. The final map gives a reasonable assessment of susceptibility of post-earthquake geo-hazards in the area. It is found that there exist safety spots within the region of high danger, which are suitable for habitations and facilities. Moreover, the hazard density near the boundaries between extreme high and high regions, or high and very low regions is larger than other regions.
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Received: 19 August 2011
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