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PRELIMINARY RESEARCH ON THE CHARACTERISTICS OF THE M_S 8.0 WENCHUAN EARTHQUAKE HAZARD

LI Zhi-qiang1)YUAN Yi-fan2)LI Xiao-li1)ZHANG Qin3)DAI Bo-yang1)YE You-qing4)GE Pei-feng5)ZENG Jie6)1)Institute of Geology,China Earthquake Administration,Beijing 100029,China2)Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China3)Earthquake Administration of Hebei Province,Shijiazhuang 050021,China4)Earthquake Administration of Sichuan Province,Chengdu 610041,China5)Earthquake Administration of Shimian,Sichuan Province,Shimian 625400,China6)Earthquake Administration of Zigong,Sichuan Province,Zigong 643000,China  
The MS 8.0 Wenchuan earthquake on 12th May 2008 caused heavy casualties and economic loss.According to the field investigations,the characteristics can be included as follows:The meizoseismal region with an intensity of XI,showing obviously zonal distribution,suffers serious destruction from the earthquake,and the destruction perpendicular to the rupture decreases sharply.At the same time,the intensity X and IX degree regions perpendicular to the rupture are narrow and therefore their coverage area is small.The intensity on both sides of the rupture attenuates rapidly,but the Ⅶ degree region and the VI degree region are wide,the latter region covering about 240,000 square kilometers.In the VI degree region,the damage area perpendicular to the rupture in the southern part is much larger than that of the northern part.Besides,many new understandings about the destruction types and destructive modes of all kinds of buildings,landform and terrain are gained in this paper.
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