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AN ANALYSIS OF THE CO-SEISMIC FAULT EFFECTS OF THE GEO-HAZARDS TRIGGERED BY wenchuan earthquake,CHINA Paper No.388

AN ANALYSIS OF THE CO-SEISMIC FAULT EFFECTS OF THE GEO-HAZAR...

ISRM-Sponsored International Symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"(SINOROCK2009)

作者： Huang Runqiu State Key Laboratory of Geo-hazard Prevention and Geoenvironment Protection, Chengdu University of Technology Chengdu,China Li Weile State Key Laboratory 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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