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作者： huang runqiu state Key {3. of geo-hazard prevention and geoenvironment protection, chengdu university of technology chengdu,china li weile state Key {3. of geo-hazard prevention and geoenvironment protection, chengdu university of technology chengdu,china

"5.12"Wenchuan Earthquake(Ms=8.0) triggered tens of thousands of geo-hazards throughout an area of about 100,000 *** distribution of geo-hazards is definitely affected by the such factors as geomorphology,topography,lithology and human engineering activities,but the distribution of earthquake-triggered geo-hazards is mainly controlled by the co-seismic fault, for they present zonal distribution along the co-seismic *** the studies of three geo-hazard concentration areas including Doujiangyan to Wenchuan Road,Beichuan to Anxian County area,and Magong to Hongguang area,it is found that Wenchuan Earthquake-triggered geo-hazards have the following co-seismic effects:(1) Wenchuan Earthquake is a thrust fault *** distribution of geo-hazards show marked"hanging wall and footwall effects",manifested by that the distribution concentration in the hanging wall of seismic fault is higher than that in the footwall and the former coverage is wider than the latter as well as that the scale of geo-hazards is larger than that in the footwall;(2) the strong development zones of geo-hazards are within the range of 7 km in the hanging wall of co-seismic *** ranges of 7 to 1 lkm in the hanging wall and o to 5km in the footwall can be delimited as the middle development zones.A vast majority of large-scale landslides are distributed within the range of 5km from the fault,and large-scale landslides are unlikely to occur within the range of over 10km;(3. the transitional and staggered positions of fault are the concentration areas of geo-hazards and large-scale geo-hazards are likely to occur in these positions;(4) the preferred direction of landslide is NW-SE,basically vertical to the spreading direction of Yingxiu-Beichuan *** may be because that Longmenshan Fault Zone has always been affected by the tectonic stress field of NW-SE extrusion area since Cenozoic Time;(5) the earthquake-triggered geo-hazards mainly occur in the zones of seismic intensit

关键词： "5.12"Wenchuan earthquake co-seismic fault effects hanging-wall effect

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Development and distribution of geohazards triggered by the 5.12 Wenchuan Earthquake in china

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Science china(Technological Sciences) 2009年第4期52卷 810-819页

作者： huang runqiu li weile state Key laboratory of geo{3. prevention and geoenvironment protection Chengdu University of TechnologyChengdu 610059China

As the Wenchuan Earthquake was of high magnitude and shallow seismic focus, it caused great dam- age and serious geohazards. By the field investigation and the interpretation of remote-sensing infor- mation after the earthquake and by using means of GIS technology, the distribution of geohazards triggered by the earthquake are analyzed and the conclusions are as follows: (1) The earthquake geo- hazards showed the feature of zonal distribution along the earthquake fault zone and linear distribution along the rivers; (2) the distribution of earthquake geohazards had a marked hanging wall effect, for the development density of geohazards in the hanging wall of earthquake fault zone was obviously higher than that in the foot wall and the width of strong development zone in the hanging wall was about 10 km; (3. the topographical slope was a main factor which controlled the development of earthquake geo- hazards and a vast majority of hazards were distributed on the slopes of 20° to 50°; (4) the earthquake geohazards had a corresponding relationship with the elevation and micro-landform, for most hazards happened in the river valleys and canyon sections below the elevation of 1500 to 2000 m, particularly in the upper segment of canyon sections (namely, the turning point from the dale to the canyon). Thin ridge, isolated or full-face space mountains were most sensitive to the seismic wave, and had a striking amplifying effect. In these areas, collapses and landslides were most likely to develop; (5) the study also showed that different lithologies determined the types of geohazards, and usually, landslides oc- curred in soft rocks, while collapses occurred in hard rocks.

关键词： 5.12 Wenchuan Earthquake seismogenic geohazard distribution remote-sensing information hanging wall effect GIS analysis

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