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.
Highlights
The Phlegrean Fields, along with the islands of Ischia and Procida, are active volcanoes developed on a ENE-WSW structural trend bordering the North-Western side of the Bay of Naples, Southern Italy
The Ischia and Procida offshore areas are characterized by several monogenetic edifices aligned along a NE-SW system of faults that connects the South-Eastern sector of Ischia to the Phlegrean Fields (Di Girolamo and Stanzione, 1973)
We performed a study of the Western Procida offshore analyzing and interpreting a detailed aeromagnetic data set recently measured in Ischia region
Summary
In this study we aim to gain insight into the features of the Phlegrean Fields-Ischia submarine ridge from the analysis and interpretation of high-resolution aeromagnetic data recently acquired in the Western Procida offshore Despite the geo-structural complexity characterizing the onshore and offshore areas of the Phlegrean Fields and Ischia, little information on this region derived from high-resolution magnetic data are presently available. High resolution aeromagnetic surveys performed recently in the Phlegrean Fields (Paoletti et al, 2004) and Vesuvian regions (Paoletti et al, 2005a) allowed the characterization of some of the main geo-structural features of these areas. This paper focuses on the data measured in the western offshore of Procida Island (fig. 3b) and we aim at the characterization of the main submarine volcanic structures of this zone
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