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The popular Newmark method calculates the cumulative permanent displacement of a landslide having a known critical acceleration as it is subjected to the effects of an earthquake acceleration time-history. For an infinite slope, this method considers ground acceleration as parallel to the slope and downslope which results in two important limitations: (1) vertical downslope acceleration only is considered; (2) the ratio of vertical to horizontal acceleration only depends on the inclination of the slope surface. In the model developed herein, the ground acceleration is not parallel to the slope; the ratio of vertical to horizontal acceleration, called the vertical accelerometric parameter, depends on the seismic situation of the slope (magnitude, earthquake source distance, style of faulting), and the vertical acceleration acts alternately upslope and downslope. Application of the principles of classical mechanics leads to the …