Evidence for the buried rim of Campi Flegrei caldera from 3-d active seismic imaging

• Published in: Geophysical research letters 2003-10, Vol.30 (19), p.SDE10.1-n/a
• Main Authors: Zollo, A., Judenherc, S., Auger, E., D'Auria, L., Virieux, J., Capuano, P., Chiarabba, C., de Franco, R., Makris, J., Michelini, A., Musacchio, G.
• Format: Article
• Language: English
• Subjects: Earth, ocean, space; Exact sciences and technology; Sciences of the Universe
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/2003GL018173

An extended marine, active seismic survey has been performed on September, 2001 in the gulfs of Naples and Pozzuoli by recording about 5000 shots at a network of 62 sea bottom and 72 on shore seismographs. 3‐D images of the shallow caldera structure are obtained from the tomographic inversion of about 77000 first P arrival times using the Benz et al. [1996] tomographic technique. The buried rim of the Campi Flegrei caldera is clearly detected at about 800–2000 m depth, as an anular high P‐velocity and high density body. It has a diameter of about 8–12 km and a height of 1–2 km. According to stratigraphic and sonic log data from deep boreholes and tomographic P velocities, the rim is likely formed by solidified lavas and/or tuffs with interbedded lava. This study confirms the existence for a depressed limestone basement beneath the caldera at less than 4 km depth, while no evidence are found for shallower magmatic bodies.