1. Karlsruhe Institute of Technology Geophysical Institute Karlsruhe Germany
2. Université Côte d'Azur IRD CNRS Observatoire de la Côte d'Azur Géoazur Nice France
3. Instituto Geofisico Escuela Politécnica Nacional Quito Ecuador
4. Department of Geosciences University of Arizona Tucson AZ USA
5. Department of Earth and Environmental Sciences Lehigh University Bethlehem PA USA