地盤調査における2,3の問題(続)

Abstract

The methods of seismic prospecting were investigated for the ground which containsa thin layer with a high velocity as a intermediate layer or a surface layer. Pickupswere installed horizontally on the surface and three components in boreholes. For theformer medium, the charactereristics of a interferring head waves in the thin layer andusefullness of reflected waves from the lower boundary of the thin layer and the floorof the basin were discussed. In the latter, continuous (degenerate) head waves wererecorded and used to estimate the velocity of the lower medium. The results wereconsistent with the geological structure of the ground obtained by the borehole observations.