Through in-situ investigation

the terrace model of Duba river is generalized. According to the geomorphic characteristics and hydrogeological investigation

Chenjiaba seismically induced landslide is located on the terrace the river; sliding surface is formed by long-term immersion of groundwater. Geological structures of sliding mass and the residua on terrace as well as the attitude of bedrock exposed at the front and posterior margin of the landslide are compared respectively; so failure mode of this landslide is determined; while the severe earthquake occurred

silty clay of the sliding surface are weakened by groundwater

which resulted in the sliding of unconsolidated accumulative formation on the terrace. The finite-difference and strength-reduction method is adopted to compute its stability factors under natural

rainstorm

seismic conditions. And three dimensional shapes of potential unstable body under different conditions are put forward.