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Spatial distribution of landslides triggered by the 2008 Ms 8.0 Wenchuan earthquake,China

Spatial distribution of landslides triggered by the 2008 Ms ...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： F.C.Dai~(a,*),C.Xu~a,X.Yao~b,L Xu~a,X.B.Tu~a,Q.M.Gong~c a Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,PR China bInstitute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,PR China c College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100022,PR China

The Ms 8.0 Wenchuan earthquake of May 12,2008 is one of the most disastrous earthquakes in China. The earthquake triggered tens of thousands of landslides over a broad area,including shallow,disrupted landslides,rock falls,deep-seated landslides,and rock avalanches,some of which buried large sections of some towns and dammed the *** purpose of this study is to investigate correlations between the occurrence of landslides with geologic and geomorphologic conditions,and seismic *** 56,000 earthquake-triggered landslides,with a total area of 811 km,are interpreted using aerial photographs and remote sensing images taken following the *** spatial distribution of these landslides is analyzed statistically using both landslide-point density(LPD),defined as the number of landslides per square kilometer,and landslide-area density(LAD),the percentage of the area affected by landslides,to determine how the occurrence of landslides correlates with distance from the epicenter, distance from the major surface rupture,seismic intensity and peak ground acceleration(PGA),slope angle,slope aspect,elevation,and *** is found that both LAD and LPD have strong positive correlations with slope steepness,distance from the major surface rupture and seismic intensity,and that Pre-Sinian schist,and Cambrian sandstone and siltstone intercalated with slate have the most concentrated landslide activities,followed by the Permian limestone intercalated with shale,and Devonian limestone. Statistical analyses also indicate that the major surface rupture has influence on the spatial distribution of landslides,because LAD and LPD are relatively higher on the hanging wall than on the ***,the correlation between the occurrence of landslides with distance from the epicenter of the earthquake is complicated,rather than a relatively simple negative correlation as found from other reported cases of *** is possibly due to complicated rupture p

关键词： Wenchuan earthquake landslides Spatial distribution landslide-point density landslide-area density

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