Figure 1

Campi Flegrei caldera: location map (digital terrain model of the area has been created by ArcGIS© ESRI, rel. 10.6 - available at www.esri.com - from the Laboratorio di Geomatica e Cartografia of the Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Italy) and stratigraphic sequence. (a) Location map of the Campi Flegrei caldera. The caldera rims, reconstructed for the Campanian Ignimbrite eruption (~ 40 ka) and the Neapolitan Yellow Tuff eruption (~ 15 ka) are shown in dashed blue and red lines, respectively, following³⁶. Deep wells location is shown with white circles, whereas sampling location for the selected eruptions with orange circles: (1) Breccia Museo (proximal sequence of Campanian Ignimbrite); (2) Neapolitan Yellow Tuff; (3) Baia; (4) Averno; (5) Monte Nuovo; (6) Cigliano; (7) Solfatara; (8) Astroni; (9) Agnano-Monte Spina. (b) Litho-stratigraphic sequence drilled in the San Vito plain, in the center of the Campi Flegrei caldera (after Rosi and Sbrana, 1987). Depth of the well in meters.