ABSTRACT The semi-finite cone model is adopted and modified to discuss the dynamic responses of the foundations, when the problem of liquefaction under the effect of cyclic loading is considered. The dynamic responses of the foundations caused by variation of the soil properties are also included. To achieve a better simulative of the physical phenomenon, this research employs the concept of wave reflections between soil layers. The responses observed for the foundation are vertical displacements, horizontal displacements, rotational angles, and twist angles in different seismic waves. Time-domain analysis is applied, so the research is constructed in time-domain completely. The soil conditions in this research are simulated as a single layer and layered system. Two types of the force simulation are employed; one is regular cycle force, and the other is irregular. To better understand the liquefaction, behavior of the variation of pore water pressure has been taken into accounts and analyzed focusly.