  Under numerical investigation is propagation of surface pendulum waves in 3D
block medium. The medium is modeled by 3D lattice of masses connected with
elastic springs and viscous dampers. The surface vertical pulsed concentrated
loading is considered. The displacements and velocities of the surface masses
are calculated. The numerical results obtained for the block medium are
compared with the similar data on elastic medium and in situ experiments
carried out by other researchers.
