1. Instituto Nazionale di Occeanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42c, 34010 Sgonico, Trieste, Italy.
2. Formerly Norsk Hydro a.s., Oil and Energy Research Center; presently Nyborg Geoconsult, Heiane 103, N-5131 Nyborg, Norway.
3. Texas A&M University, Department of Geology and Geophysics, College Station, Texas 77843-3114.