ABSTRACT
The limit of terra condition in the intense earthquake country exerts influence on the magnifying and narrowing effect of vibration caused by site soil. Because of its microstructure property, the thick loess has rare possibility to become the special layers of magnifying seismic waves or to make loess lose structure intensity in an instant, thus it is also the fundamental reason for the aggravation of the earthquake disaster. An effect of site loess magnifying earthquake waves was proposed in thinking of the mechanism for loess seismic landslides. Land deformation mainly demonstrates as landslides. When the earthquake driving force exceeds the stability of the site itself, it would result in ground failure and site unbalance, such as landslides of Dang-jiacha. The concentrated distribution of the landslide caused by loess liquefaction in Xiji country is near the concealed fault zone along Lanni River.
