Abstract
Magnetic theory and application to a complex volcanic area located in Southern Italy are here discussed showing the example of the Gulf of Naples, located at Southern Italy Tyrrhenian margin. A magnetic anomaly map of the Gulf of Naples has been constructed aimed at highlighting new knowledge on geophysics and volcanology of this area of the Eastern Tyrrhenian margin, characterized by a complex geophysical setting, strongly depending on sea bottom topography. The theoretical aspects of marine magnetometry and multibeam bathymetry have been discussed. Magnetic data processing included the correction of the data for the diurnal variation, the correction of the data for the offset and the leveling of the data as a function of the correction at the cross-points of the navigation lines. Multibeam and single-beam bathymetric data processing has been considered. Magnetic anomaly fields in the Naples Bay have been discussed through a detailed geological interpretation and correlated with main morpho-structural features recognized through morpho- bathymetric interpretation. Details of magnetic anomalies have been selected, represented and correlated with significant seismic profiles, recorded on the same navigation lines of magnetometry. They include the continental shelf offshore the Somma-Vesuvius volcanic complex, the outer shelf of the Gulf of Pozzuoli offshore the Phlegrean Fields volcanic complex, the relict volcanic banks of Pentapalummo, Nisida and Miseno, the Gaia volcanic bank on the Naples slope, the western slope of the Dohrn canyon, the Magnaghi canyon’s head and the magnetic anomalies among the Ischia and Procida islands.
Highlights
One aim of the present paper is to show the magnetic anomaly map of the Naples Bay [1], which has furnished a new contribution to the knowledge of the geophysics and the volcanology of this active volcanic area, located at the Eastern Tyrrhenian margin, characterized by a complex geological setting, depending on the interference between volcanic and sedimentary processes during the Late Quaternary [2]-[6]
This has allowed for the construction of a high resolution magnetic anomaly map of the Naples Bay, which has evidenced the occurrence of complex magnetic anomaly fields, previously unknown, related to geological structures having a volcanic nature and/or to volcanic morpho-structural highs, evident from the Multibeam bathymetry of the Gulf of Naples [8] [9]
It is worth mentioning the previous lack of magnetic data in the marine sector of the Gulf of Naples, both on the aeromagnetic survey [7] and the magnetic anomaly map of Italy constructed by the National Institute of Geophysics and Volcanology (INGV, Rome, Italy) [10]
Summary
One aim of the present paper is to show the magnetic anomaly map of the Naples Bay [1], which has furnished a new contribution to the knowledge of the geophysics and the volcanology of this active volcanic area, located at the Eastern Tyrrhenian margin, characterized by a complex geological setting, depending on the interference between volcanic and sedimentary processes during the Late Quaternary [2]-[6]. The magnetic survey of the Naples Bay acquired by the Institute of Marine and Coastal Environment of the National Research Council of Naples (Italy) onboard of the R/V Urania (CNR) during the oceanographic cruise GMS98-01 (May-June 1998) and GMS00-05 (October-November 2000) shows a densely spaced coverage, distinguishing from the aeromagnetic surveys, previously recorded in the area and characterized by a large coverage [7] This has allowed for the construction of a high resolution magnetic anomaly map of the Naples Bay, which has evidenced the occurrence of complex magnetic anomaly fields, previously unknown, related to geological structures having a volcanic nature and/or to volcanic morpho-structural highs, evident from the Multibeam bathymetry of the Gulf of Naples [8] [9]. The Wavelet transform is a feasible technique to study not stationary signals, in which there is the superimposition of high and low frequency signals [14] [15]
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