The reflection and refraction methods are the usual ways to obtain information about the subsurface structures in exploration geophysics. Recently, the energy of seismic waves was introduced to the geophysical community as a new exploration tool. Seismic Interferometry (SI) , which is investigated in this thesis, is one of these new methods. It makes use of the cross-correlation function of seismograms to estimate the velocity of surface waves. Since both the velocity and the penetration depth of surface waves are frequency dependent, SI provides a means to draw conclusions about the subsurface. Although providing a poorer resolution, SI is a much cheaper method than the traditional methods. This thesis outlines the use of SI in providing a velocity map for a region in central Iran .