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Abstract In order to find out the characteristics of Woqian landslide triggered by Wenchuan earthquake and discuss the instability mechanism of the landslide，the author has investigated the landslide area many times. The investigation results show as follows：(1) The geologic structure of Woqian landslide is up hardness and down softness，and up steep and down slow，belongs to a kind of landslide with pattern of rips-tend towards slide. (2) Woqian landslide is an intense start-up and long run-out landslide triggered by Shikan fault movement，and its hanging-wall effect，energy convergence release effect，long time and repeat effect of earthquake wave，zoom in effect of terrain，level acceleration effect. (3) Woqian landslide behaves a series of movement and accumulation characteristics differing from landslide by gravity，for example landslide cliff of high and coarse，centrifugal super high in curve，throw to side，classify accumulation，come into being 5 areas，i.e. landslide source，steep accelerate segment，sturzstroms，accumulation and side throw. (4) Woqian landslide comes through four stages，i.e. slope shake fissure，high speed canker，sturzstrom and accumulation. The peak velocity is 56.1 m/s when sliding distance is about 800 m. The whole moving time is 57.1 s，and the average velocity is 35.6m/s in the sliding process. High potential energy and fluidization is the main reason for Woqian long run-out landslide.
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Received: 23 April 2010
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2011, Vol. 30 
