Nuova immagine magnetica del Mar Tirreno: integrazione ed elaborazione dei dati acquisiti dal 1996 ad oggi

Abstract

We present a high resolution magnetic anomaly map of the Tyrrhenian Sea obtained by processing the data acquired by ISMAR-CNR during two cruises in 1996 and 1999, and in the Aeolian area since 2002. The morphology and geological setting of this Tortonian back-arc basin has been extensively studied and highlighted since 1960, keeping on pace with technological advancements for newer insights. The availability of swath multibeam systems enabled a significant jump in the knowledge of the basin. A full bathymetric coverage was obtained from the upper slope to the bathyal plain along with 60000 km of magnetic, gravimetric and seismic data. We present the results of the processing of the magnetic data. Standard techniques were applied (de-spiking, filtering, IGRF and pole reduction, heading effects and crossover errors analysis), producing an image at the resolution of 1km at the basin scale, and better in shallower areas. Significant insight was obtained for poorly investigated areas, mainly to the North (Montecristo Basin) , other than a better detail on the submarine volcanic structures in the Central and South East portions of the basin. The data were also integrated with new CNR and INGV acquisition in the Panarea-Stromboli area (2002 to 2006). We present also a time-lapse study on the Panarea gas exhalation area, suggesting a clear relationship between the magnetic properties and gas flux variations in time.