The survey has been carried out on board of the R/V Bannock - CNR. During the cruise, the main aim of which was the reconstruction of the geological and geodynamic evolution of the Tyrrhenian basin, a grid of single channel seismic profiles was collected using a 30 kJ - Sparker source (Teledyne Exploration, Houston - USA). From the original radio navigation system Loran-C, the coordinates have been later converted into geographical. The sparker profiles total 668,5 nm and are organized in groups named after the investigated areas. The areas investigated during the survey T71, Leg IV are: Cefalù Basin (seismic profiles T71-BC), Paola Basin Sapri Basin (seismic profiles T71-BP), and the most eastern Tyrrhenian abyssal plain (seismic profiles T71-PM). The cruise has been carried out from 1th November to 20th November 1971. P. Ferretti was part of the technical team. PI was the Dr. A. Fabbri.