Il centro antico di Pozzuoli: un esempio di interazione fra eventi geologici, articolazione del sottosuolo e storia degli insediamenti.

In this paper some scientific issues, analysed after the 1982.1984 bradyseismic crisis at Phlegrean Fields, have been reviewed and re-examined. After the analysis of the peculiar features of tlze area in terms of interaction between urban settlements history and geo2ogical phenomena (bradyseismic aizd volcanic activiiy), the structural and stratigraphic setting of the portion of Pozzuoli urban area, located around the Rione Terra and the Anfiteatro Flavio, is described. Drill-lzole data analysis, performed using a Geographical Ilzformation System, and tlze results of geophysical investigations and laboratory and field geotechnical tests, allowed to recognize three main lithologic units: tuff bedrock; a sequence of marine and continental pyroclastic deposits; made-land and filling malerial. The characters and the geometry of these units are described, with particular emphasis on fills, which are vey interesting from the geoarcheological and geothecnical points of view. ,i On the basis of: - the depth of the top of the tuff from the ground surface; - the thickness of the fills; - the depth of the piezometric level; a partition of the area into three zone, important from the point of view of the ground elfects related to the bradyseism, is proposed. The comparison with the buildings damages distribution suggests interesting insights, in particular regarding to the coastal belt and the Rione Terra-Anfiteatro Flavio sector.