1. Department of Geological Sciences; University of Florida; Gainesville Florida USA
2. Now at Department of Geosciences; Virginia Tech; Blacksburg Virginia USA
3. Department of Geophysics; University of Bucharest; Bucharest Romania
4. Now at Geoscience Division, School of Interdisciplinary Studies; Mahidol University-Kanchanaburi Campus; Kanchanaburi Thailand
5. DTM; Carnegie Institution of Washington; Washington District of Columbia USA
6. Department of Geosciences; Virginia Tech; Blacksburg Virginia USA