redrawn by M.Maistrello - INGV-MI
            in the frame of analog data processing for preparing the following:
               
            Italian Explosion Seismology Group (1980, reporter: Scarascia S.)
            Calabrian Arc project: first results of the 1979 seismic experiments.
            Proceedings of 7th EGS-ESC Gen. Ass. (Budapest, 1980); 20 pp.