THE CAMPANIA-CAMPI FLEGREI AREA - A CONTRIBUTION TO DISCERN THE BEST STRUCTURAL MODEL FROM GRAVITY INTERPRETATION

Structural interpretations of negative gravity anomalies at Campi Flegrei and Campania are reviewed. The interpretations are not uniquely determined, as different models correspond to equally good anomaly fits. These models are examined using a new method based on the interpretation of the apparent density map computed from the gravity anomaly map. As regards the Campi Flegrei anomaly, a funnel-shaped caldera 3D model is readily obtained. This is more appropriate than previous interpretations, as not only anomaly but also apparent densities are fitted. As about the regional structures, the used approach suggests that the more pertinent model is a large magmatic intrusion, 9 to 14 km deep. A final scheme is proposed linking this intrusion to the funnel-shaped caldera as the main regional reservoir.