Amplification of acceleration is a design concern because it can generate larger accelerations leading
to larger destabilizing dynamic earth pressure and wall inertia. The acceleration amplification factors
at top of the facing wall and at the depth of 5 cm in the reinforced soil zone (Fig. 2, 3a, and 4a) can be
calculated by dividing the outward peak acceleration amplitude by the corresponding base peak
acceleration amplitude. The results of these calculations are plotted versus base acceleration amplitude
in Fig. 9.