Ground Deformation and Gravity Changes Accompanying the 1982 Pozzuoli Uplift

摘要: During the summer of 1982 a continuous uplift began at Phlegraean Fields, an active volcanic area in southern Italy (Fig. 1), that persisted up to September 1984. The uplift, which reached maximum value about 160 cm central part caldera, was characterized by variable velocity and occurred within extended 7 km outward from town Pozzuoli 1); surface deformation performs bell-shape pattern. accompanied horizontal displacements gravity changes closely correlate with described elevation changes. displayed anomalous pattern narrow belt 1 center approximately coincident seismic activity. change is attributed primarily free-air effect small Bouguer must be added. Several models have been invoked order explain observed phenomenon. one gives best fit data increasing pressure source radial simmetry, constant depth 3 beneath Pozzuoli, having diameter several hundred meters. Migration magma believed responsible for activity Fields caldera.