Magnetic signature of submarine volcanoes in the Phlegrean Fields-Ischia Ridge (North-Western side of the Bay of Naples, Southern Italy)

V. Paoletti, A. Rapolla, M. Secomandi

Abstract


This paper presents a study of the Phlegrean Fields-Ischia submarine ridge by the analysis and interpretation of
high-resolution aeromagnetic data recently acquired in the Western Procida offshore. The investigated area is located
along the ridge connecting Ischia to the Phlegrean Fields and is characterized by the existence of several
monogenetic volcanoes aligned on a NE-SW system of faults. The high-resolution magnetic data yielded new
information on the area, highlighting particularly the signature of a volcanic body located between Pt. Serra and
the Ruommoli shoal. This structure has not been clearly described before and we named it as the Pt. Serra submarine
volcano. The computation of the analytic signal and horizontal gradient of the data distinctly located this
structure and definined the position of its rims. A 2D modeling and 3D inversion of data provided information
on the volcanos thickness, width and magnetization, disclosing a meaningful igneous body extending down to
several hundred meters b.s.l.

Keywords


Aeromagnetic survey;Submarine volcanoes;Phlegrean Fields-Ischia Ridge;Procida offshore

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References


DOI: https://doi.org/10.4401/ag-3021
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X