1. ISTerre; University of Grenoble I and CNRS; Grenoble France
2. Physics of Geological Processes; University of Oslo; Oslo Norway
3. Department of Geosciences; Pennsylvania State University; Pennsylvania USA
4. ESPCI, UMR Gulliver/EC2M, 10; Paris Cedex 05 France
5. CEA-Saclay, DSM/IRAMIS/SPEC; Gif-sur-Yvette Cedex France