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

• Main Authors: M. Secomandi, A. Rapolla, V. Paoletti
• Format: Article
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2008-06-01
• Series: Annals of Geophysics
• Subjects: Aeromagnetic survey; Submarine volcanoes; Phlegrean Fields-Ischia Ridge; Procida offshore
• Online Access: http://www.annalsofgeophysics.eu/index.php/annals/article/view/3021

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.