1. ISM-CNR; P.O. Box 10, 00015 Monterotondo Stazione Rome Italy
2. Via dei Vascellari 34, 00153 Rome Italy
3. Applied Geological Sciences and Geophysics; University of Leoben; Leoben A-8700 Austria
4. D.E.Ü. Engineering Faculty; Geological Engineering Department; İzmir Turkey