GNGTS 2013 - Atti del 32° Convegno Nazionale

related to the Procida continental shelf, to the Gaia bank, to the head of the Magnaghi canyon, to an edifice located among the Dohrn and Magnaghi canyons, to the Magnaghi canyon and to the Ischia bank. Magnetic anomaly measurements in the Gulf of Pozzuoli. The magnetic field anomalies in the Gulf of Pozzuoli (modified after Galdi et al. , 1988), have shown both positive and negative anomalies (Fig. 3). The area shows an interruption of the regional trend from NE to SW, where circular anomalies are probably connected to a post-calderic activity of the Phlegrean Fields. Moreover, the internal area of the Pozzuoli Bay is characterized by a negative anomaly, increasing towards the south. Conversely, in the external area there is mainly an alternance of positive and negative anomalies, with a dominance of positive values near the area of Bagnoli. The inner continental shelf of the Gulf of Pozzuoli is regarded as negative magnetic anomalies. In particular, the area surrounding the Pozzuoli harbour does not show significant magnetic anomalies. On the contrary, the area adjacent the resort Lucrino- Punta Pennata owns a negative anomaly increasing southwards up to the magnetic minimum at 600- 700 m in correspondence to the Baia Castle. On the outer shelf of the Gulf of Pozzuoli it is possible to observe magnetic maxima and minima. In particular, an area of magnetic maximum is located on a belt long about 1.7 km, NE-SW oriented. At the same time, the inner continental shelf of the Gulf of Pozzuoli, from Bagnoli to the Rione Terra of Pozzuoli shows two strong magnetic anomalies, separated by a thin belt having a normal magnetic value. Proceeding seawards, in the offshore surrounding Bagnoli, two magnetic minima (40 nT and 60 nT) are positioned, which result slightly Fig. 2 – High resolution magnetic anomaly map of the Naples Bay (on the left in the figure; modified after Aiello et al. , 2004). The inset shows a detail of the magnetic map offshore the Somma-Vesuvius volcanic complex. Fig. 3 – Interpreted map of the magnetic anomalies of the Gulf of Pozzuoli (modified after Galdi et al. , 1988). The positive anomalies are represented in yellow and the negative anomalies in light yellow. 89 GNGTS 2013 S essione 3.2