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Evidence for the buried rim of Campi Flegrei caldera from 3‐d active seismic imaging
Author(s) -
Zollo A.,
Judenherc S.,
Auger E.,
D'Auria L.,
Virieux J.,
Capuano P.,
Chiarabba C.,
de Franco R.,
Makris J.,
Michelini A.,
Musacchio G.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl018173
Subject(s) - caldera , geology , seismology , lava , volcano , fumarole , seismometer , impact crater , inversion (geology) , tectonics , physics , astronomy
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.