The aim of this investigation is to study the dynamic behavior of the Moshampa earth dam (Iran),
considering dam-foundation interaction, under normalized Manjil earthquake as input motion. In order
to assess the effect of the foundation widths in the finite element model on the earthquake response,
various dam-foundation coupled models are analyzed by Plaxis, a finite element package for solving
geotechnical problems. The results indicate considerable differences in the seismic responses.