1. Earth Sciences Department; Royal Museum for Central Africa; Tervuren Belgium
2. Now at Division of Marine Geology and Geophysics; Rosenstiel School of Marine and Atmospheric Sciences, University of Miami; Miami Florida USA
3. European Center for Geodynamics and Seismology; Walferdange Luxembourg
4. Department of Geography, Earth System Science; Vrije Universiteit Brussel; Brussels Belgium
5. Department of Geophysics/Astrophysics; National Museum of Natural History; Walferdange Luxembourg