Abstract
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.
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