Dept. Earth & Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, United States
Dept. Earth & Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, United States
Dept. Earth & Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, United States ; Institut de Physique du Globe, Equipe de Tectonique -UMR7154, Boite 89, Paris, 75252, France
Institute of Geophysics & Planetary Physics, University of California, San Diego, IGPP 0225, La Jolla, CA 92093, United States