1978 Volume 17 Issue 4 Pages 287-298
As a various kind of the artificial ground movements are observed in the south Kanto district, we have described only the artificial ground movements with the developments of the ground water resources and the natural gas resources (natural gas bearing salt water) in this paper.
The stratum-deformation patterns caused by the pumping action are different according to the geological age of the stratum. The Holocene deposits have shown generally the irreversible consolidation with the draw down of ground water pressure by the pumping discharge.
The Pleistocene deposits, however, have been contracted under the decrease of ground water pressure by the over pumping discharge but have been rebounded slightly under the recovering of the ground water pressure by the pumping control.
On the other hand, it has been observed that the pulse of the ground water pressure has been annually by the change of pumping discharge of the wells for the agricultural use and etc., and has been conveyed undulatingly to a distance. Therefore, it seems that the ground movements have been carried undulatingly by the undulative change of the ground water presures.
