1. Department of Geological and Environmental Sciences; Stanford University; Stanford California USA
2. Geology UMR IDES; Faculty of Science; Orsay France
3. Cameca; Courbevoie France
4. Biomechanical Engineering Division; Stanford University; Stanford California USA
5. Laboratoire de Sciences du climat et de l'Environnement; CNRS-CEA; Gif sur Yvette France