Wave generations from line sources within the ground are studied.Numerical details are worked out for the line source of step function type in time. The results to be noted are as follows;(1) At the "epicenter", the displacement is a simple pulse followed by a gradual decrease to a permanent displacement.(2) RAYLEIGH waves appear at a certain distance from the epicenter. (3) Permanent displacements are rather large even at points far away from the origin. They are comparable with the amplitudes of RAYLEIGH waves at the respective paints.(4) There is no S phase in seismograms to be obtained for the wave origin of dilatational type.
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