The Stromboli geophysical experiment. Preliminary results on high resolution DTM of Stromboli island (Southern Tyrrhenian sea, Italy)

Preliminary results on the Stromboli geophysical experiment, carried out based on onshore and offshore data acquisition around the Stromboli volcano and finalised to reconstruct a seismic tomography of the volcano and to investigate the deep structure and the location of the magma chambers are here presented. A new detailed swath bathymetry around the Stromboli volcano has been recently recorded by the CNR-IAMC Institute during the oceanographic cruise STRO-06 (December 2006) by using the echosounder RESON 8160 in dotation to the R/V Urania. Main aim of the cruise was onshore and offshore data acquisition around the Stromboli volcano, finalised to reconstruct a seismic tomography of the volcano and to investigate the deep structure and the location of magma chambers. During the Stromboli geophysical experiment, wide angle refraction seismics was performed all around the Stromboli volcano by a 4 GI-GUN array. It has been used the permanent seismic network of the INGV, incremented for the experiment of 18 temporary stations and 10 OBS, deposited on SE, SW and NE submerged flanks of the volcano after detailed morpho-bathymetric analysis. The Digital Terrain Model (DTM) of the Stromboli island was obtained through the processing of the bathymetry carried out by using the software PDS2000 licensed to the CNR-IAMC of Naples, Italy. Due to its high resolution, the new DTM of the Stromboli island gives interesting information about the submerged structure of the volcano, particularly about the volcano-tectonic and gravitational processes involving the submarine flanks of the edifice. Particular attention was paid to the acquisition of new bathymetric data on the "Sciara del Fuoco" area, aimed at carrying out an up-to-date monitoring of the sea bottoms involved by the submarine slide of 30-12-2002, controlling the tsunami in the surrounding coastal area.