In geotechnical investigation, determination oftheseismic bearing capacity of foundation soil
constitutes an important task. The bearing capacity of soil under static loading has been extensively
studied since the early work of Prandtl (1921).Design of foundation in seismic areas needs special
considerations compared to the static case. The inadequate performance of structure during recent
earthquake has motivated researches to revise existing methods and to develop new method for
seismic resistant design. For foundation of structure built in seismic areas the demands to sustain load
and deformation during earthquake will probably be the severe in their design life. Due to seismic
loading foundation may experience decreases in bearing capacity and increases in settlement. Two
source of loading must be taken into consideration inertial loading caused by lateral forces imposed on
the superstructure, kinematic loading caused by the ground movement developed during earthquake.