A simplified technique for calculation of the dynamical ground compliance for an arbitrary-shaped rigid foundation is presented. This numerical method is based on a reduction of integral equations to linear algebraic equations by subdividing the contact area into subregions. Following points are mainly improved:
(1) in order to enable analytical integrations, Green's functions are approximated to power series or linear functions;
(2) the contact area is subdivided into triangular-shaped subregions; and
(3) linear distribution of the contact pressure is assumed in each subregion.
In order to discuss an accuracy of this method, circular and square foundations resting on an elestic half-space are examined.