GNGTS 2018 - 37° Convegno Nazionale

258 GNGTS 2018 S essione 1.3 wedge phase temporally corresponds to the end of an unrest phase. Finally, aggrading bodies indicative of subsidence are coeval to periods of volcanic quiescence. This subsidence has both a component related to post-resurgence collapse and a secular component. A differential behavior between ~3.8-2.5 ky has been highlighted between the central resurgent dome sector which is more subsiding because of the marked post-resurgence collapse, and the less subsiding peripheral sectors. After 2.5 ky, all sectors underwent a similar slower subsidence which likely reflects a regional trend. The shift from a local to a regional subsidence is supported by rates provided by analysis of submerged archaeological sea-level markers off the Bay of Pozzuoli (Naples and Vivara island). References Di Vito M. A., Isaia R., Orsi G., Southon J., de Vita S., D’Antonio M., Pappalardo L. and Piochi M.; 1999: Volcanism and deformation in the past 12 ka at the Campi Flegrei caldera (Italy). Journal of Volcanology and Geothermal Research, 91 , 221–246. Fedele L., Insinga D.D., Calvert A.T., Morra V., Perrotta A. and Scarpati C.; 2011: 40Ar/39Ar dating of tuff vents in the Campi Flegrei caldera (southern Italy): toward a new chronostratigraphic reconstruction of the Holocene volcanic activity. Bullettin of Volcanology, 73 (9), 1323–1336.  Lambeck K., Antonioli F., Anzidei M., Ferranti L., Leoni G., Scicchitano G. and Silenzi S.; 2011: Sea level change along the Italian coast during the Holocene projections for the future. Quaternary International, 232 , 250–257.  Marturano A., Isaia R., Aiello G. and Barra, D.; 2018: Complex dome growth at Campi Flegrei caldera (Italy) in the last 15 ka. Journal of Geophysical Research: Solid Earth, 123 . https://doi.org/10.1029/ 2018JB015672. Pepe F., Ferranti L., Sacchi M., Bertotti G., Collura A.M. and Sulli A.; 2014: Pattern and rate of post-20 ka vertical tectonic motion around the Capo Vaticano Promontory (W Calabria, Italy) based on offshore geomorphological indicators. Quaternary International, 332 , 85–98.  Sacchi M., Pepe F., Corradino M., Insinga D.D., Molisso F. and Lubritto C.; 2014: The Neapolitan Yellow Tuff caldera offshore the Campi Flegrei: stratal architecture and kinematic reconstruction during the last 15 ky. Mar. Geol., 354 , 15–33. Smith V.C., Isaia R. and Pearce N.J.G.; 2011: Tephrostratigraphy and glass compositions of post-15 kyr Campi Flegrei eruptions: implications for eruption history and chronostratigraphic markers. Quaternary Science Reviews, 30 , 3638–3660.  Steinmann L., Spiess V. and Sacchi M.; 2016: The Campi Flegrei caldera (Italy): formation and evolution in interplay with sea-level variations since the Campanian Ignimbrite eruption at 39 ka. J. Volcanol. Geotherm. Res., 327 , 361–374. Steinmann L., Spiess V. and Sacchi M.; 2018: The Post-collapse evolution of a coastal caldera system: Insights from a 3D multichannel seismic survey from the Campi Flegrei caldera (Italy). J. Volcanol. Geotherm. Res., 349 , 83–98. STRUCTURAL FRAME AND VOLCANO-TECTONIC EVOLUTION OF THE CAMPI FLEGREI COLLAPSE CALDERA-RESURGENT DOME SYSTEM IN THE POZZUOLI BAY BASED ON MULTISCALE SEISMIC PROFILE ANALYSIS J. Natale 1 , L. Ferranti 1 , C. Marino 1 , M. Sacchi 2 1 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università “Federico II”, Napoli, Italy 2 Istituto per l’Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy The present study aims at contributing to the knowledge of the Campi Flegrei caldera structural framework and volcano-tectonic evolution using high-resolution seismic profiles analysis in the Pozzuoli Bay, Southern Italy. Due to its history of recurrent explosive eruptions, its ongoing episodes of unrest, and its high population density with nearly 2.5 million people living in the close vicinity, the Campi Flegrei caldera represents one of the world’s maximum volcanic risk areas. As a future eruption could have significant impact on local to regional scale due to the intense urbanization and the explosive eruptive style, the comprehension of its genesis and evolution is extremely relevant.