Abstract
In the limit equilibrium method of seismic design of earth dams, the computation of displacements during earthquakes play an important part. Since Newmark (1) presented his technique of a rigid block sliding on a plane surface, designers have tried to use it to compute the displacement of the crest during an earthquake. The sliding block technique gives displacements along a fictitious plane which is not properly defined. The definition given by Sarma (3) also is arbitrary.

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