Reprocessing of the CROP M12A seismic line focused on shallow-depth geological structures in the northern Tyrrhenian Sea

Abstract

This work deals with the reprocessing of the M12A CROP marine seismic profile, that crosses the northern Tyrrhenian Sea, south of Elba Island. The reprocessing was carried out to improve the visibility and resolution of the structures corresponding to the lower crust (two-way traveltimes lower than 4 s) that are located at depth. In this time window, we apply recently developed methodologies to enhance the signal-to-noise ratio, paying particular attention to the suppression of the short and long period reverberations and to the velocity model building for depth migration. The velocity field used for the depth conversion is iteratively updated by means of the migration velocity analysis on common image gathers. The final products of this work are time and post-stack, depthmigrated sections that can contribute to the understanding of the structural complexity of the investigated area.