Movimenti verticali del suolo nella Pianura Padana orientale desumibili dai dati IGM fino a tutto il 1990

Between the surveys carried out in the 1970s and the most recent ones, the phenomenon has diminished markedly in the whole of the area in Veneto, in the eastern part of the province of Ferrara and in the coastal strip of Romagna. In contrast there has been a notable increase in Bologna and its province (at Castelmaggiore is exceeds 10 cm/year) and between Forlimpopoli and Forli; slight increases were also recorded in the central part of the province of Ferrara. The most marked subsidence occurs in the areas which have been recently industrialised and this can be interpreted as the effect of excessive drainage of groundwater. The synoptic consideration of the movements recorded in the whole network means that it is possible to make some general observations on the influence of the geological situation on the subsidence; in particular it highlights a general coincidence between the marked velocity of subsidence in some zones and notable thicknesses of loose Quaternary and Pliocene sediments.