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The integration of magnetic data in the Neapolitan volcanic district

¹ Dipartimento di Scienze della Terra, Università di Napoli Federico II, Largo S. Marcellino 10, 80138 Naples, Italy

View larger version (50K): [in this window] [in a new window]   Figure 1. A: Location of study area. B: Neapolitan volcanic district, southern Italy

View larger version (62K): [in this window] [in a new window]   Figure 2. Geological sketch map of the Campanian Plain (Bonardi et al., 1988). Solid black lines indicate the main faults singled out by seismic studies (Bruno et al., 1998, 2003; Milia and Torrente, 1999), barbs are on the downthrown side. Dashed lines show fault location extrapolated from seismic data. Blue lines show the main gravimetric and magnetic lineaments identified by Florio et al., 1999. Yellow lines indicate the faults in Ischia Island (quoted in Nunziata and Rapolla, 1987). MSF—Magnaghi-Sebeto fault; VF—Vesuvius fault; 41 PL— 41st-N-parallel magnetic lineament; P2—Parete 2 well; TC1—Trecase 1 well

View larger version (56K): [in this window] [in a new window]   Figure 3. Different data sets used in integration and contouring of the relative magnetic fields. Data sets A, B, C, D, and F have the same color scale. See text for details about the data sets

View larger version (49K): [in this window] [in a new window]   Figure 4. Map of the reduced-to-the-pole (rtp) integrated magnetic data set of the whole volcanic Neapolitan region. A: The draped data (clearance 200 m) are overlain on the topography and bathymetry of the area. See text for definitions. B: The rtp map overlaid by a sketch map of the outcropping volcanic rocks (Bonardi et al., 1988) and by the main mapped faults (Bruno et al., 1998, 2003; Milia and Torrente, 1999; Nunziata and Rapolla, 1987) of the area. 41 PL— 41st-N-magnetic parallel lineament; MSF—Magnaghi-Sebeto fault; VF—Vesuvius fault

View larger version (50K): [in this window] [in a new window]   Figure 5. Three-dimensional inversion of the two main anomalies measured in the northern Phlegrean Fields, marked with A and B in Figure 4A. A: Close-up of the reduced-to-the-pole anomalies in the Parete area. B: Magnetization model obtained from inversion. See text for details

View larger version (40K): [in this window] [in a new window]   Figure 6. A: Map of horizontal derivative of the reduced-to-the-pole draped data set of the Neapolitan region. See text for definitions. B: Same map as in A overlain with the main lineaments from seismic studies (in red) (Bruno et al., 1998, 2003; Milia and Torrente, 1999), the outline of Phlegrean caldera from gravimetric horizontal-gradient-maxima (in white) (Florio et al., 1999), and the Ischia faults (Nunziata and Rapolla, 1987). The axes of the two canyons of the Bay of Naples are in yellow. 41 PL— 41st-N-magnetic parallel lineament; MSF—Magnaghi-Sebeto fault; VF—Vesuvius fault

View larger version (44K): [in this window] [in a new window]   Figure 7. A: Comparison between the horizontal-gradient-maxima map and the location of vents of different ages (Orsi et al., 1996) in the southern Phlegrean Fields. B: Main structures identified in this work: the buried magnetic sources of volcanic origin are in white, the magnetic sources of volcanic origin characterized by surface evidence are in pink, and dashed yellow lines separate the magnetized volcanic areas of the Bay of Naples from the magnetically quiet sedimentary sector. See text for definitions