There has been a tendency for seismic failures to occur frequently on concave or flat slopes or slope having abrupt local unevenness. This tendency has been considered to be affected greatly by the topographic effects that amplify the acceleration of seismic waves. In order to clarify the quantitative evaluation of the amplitude of seismic acceleration and how the amplitude affects the slope displacements, a three-dimensional non-linear dynamic response analysis based upon the elasto-plastic theory was applied to three model slopes having different topographic features, that is, a convex slope, convex and flat slope, and uneven slope. The results of the analysis are summarized as follows. Amplitude of seismic wave acceleration is affected by slope having abrupt local unevenness. Especially, changes slope curvatures in the surface slope affect on amplification or attenuation of seismic wave acceleration. Residual displacements were not so clear, but it is to be greater by local unevenness.
