A three-dimensional finite difference elastic wave model was developed to estimate the
feasibillity of surface wave applications in geotechnical problems. The wave motions
calculated by the developed program in this study compare favorably with well known
analytic solutions. The surface wave motions calculated from layered-dam type
curves, but a special source of high energy (frequencies lower than 10 hertz [Hz]) is
meeded to assess the physical properties at depths on the order of tens of meters. A
high-energy source in the low frequency band, however, can result in structural damage
to a dam, which would limit field applications of the program. The dispersion curves
calculated from the surface wave motion of homogeneous and center-core type dam models
would result in fatal errors in the model if the conventional infinite layer structure
is used in their interpretation. This is because the surrounding materials and
boundaries of a dam create some distortion in the dispersion curve of the surface wave.
It is strongly recommended to use a three-dimensional inversion model for correct
interpretation and estimation of physical properties of dam materials when using the
surface wave application for dam inspection.