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The land subsidence of the Nobi Plain largely ceased with the commencement\udof pumping regulations beginning in 1975. However, a small amount of land\udsubsidence, less than one centimeter, is still observed at the Delta zone in\udthe southwest part of the Plain. The authors attempted to investigate the\udcause of the small amount of existing subsidence. The alluvial clay layer\uddeposits are more than 15–20 m thick and the withdrawal is small. The decrease\udof the yearly average groundwater level has not been confirmed.\ud  \udOn the other hand, the seasonal change in the groundwater level is clearly\udobserved. This investigation focuses on the seasonal change of groundwater\udlevel each year and its relation to the thickness of alluvial clay layer.\udThe Delta zone was divided into several cells and a multiple regression\udanalysis was applied to the seasonal change of the groundwater level and the\udthickness of alluvial clay layer of the cell. The study concluded that the\udsmall amount of land subsidence was caused of drawdown of piezometric head\udof groundwater every year during the summer

Factor analysis on land subsidence in the Nobi Plain, southwest Japan