Diego Melgar, University of Oregon, Department of Earth Sciences, Eugene, OR, United States, Giovanni Occhipinti, Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France, Brendan Crowell, University of Washington, Department of Earth and Space Sciences, Seattle, WA, United States and Attila Komjathy, NASA Jet Propulsion Laboratory, Pasadena, CA, United States