Tarje Nissen-Meyer¹, Benjamin Fernando², Kuangdai Leng², Nicholas C Schmerr³, Mark P Panning⁴, Eleonore Stutzmann⁵, Ludovic Margerin⁶, Nobuaki Fuji⁵, Renee C Weber⁷, William Bruce Banerdt⁸, Domenico Giardini⁹, Philippe Henri Lognonné⁵ and William T Pike¹⁰, (1)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, (2)University of Oxford, Oxford, United Kingdom, (3)University of Maryland College Park, Geology, College Park, MD, United States, (4)Univ of FL-Geological Sciences, Gainesville, FL, United States, (5)Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France, (6)Observatory Midi-Pyrenees, Toulouse, France, (7)NASA/NSSTC, Huntsville, AL, United States, (8)Jet Propulsion Laboratory, Pasadena, CA, United States, (9)ETH Zurich, Zurich, Switzerland, (10)Imperial College London, London, SW7, United Kingdom