Kenneth J Hurst¹, Fredrik Andersson², William Bruce Banerdt¹, Marco Bierwirth³, Nadine Brinkmann⁴, Savas Ceylan⁵, Constantinos Charalambous⁶, Pierre Delage⁷, Lucile Fayon⁸, Raphael Garcia⁹, Domenico Giardini⁵, Brigitte Knapmeyer-Endrun¹⁰, Sharon Kedar¹¹, Philippe Henri Lognonné⁸, John McClean¹², David Mimoun¹³, Naomi Murdoch¹⁴, William T Pike⁶, Johan O A Robertsson¹⁵, Cedric Schmelzbach¹⁶, Nicholas C Schmerr¹⁷, Alexander Stott¹², David Sollberger⁵, Jennifer Stevanović¹⁸, Simon C Staehler¹⁹, Nicholas A Teanby²⁰, Martin van Driel²¹, Nicolas Verdier²², Christos Vrettos²³ and Tristram Warren²⁴, (1)Jet Propulsion Laboratory, Pasadena, CA, United States, (2)ETH-Zurich, Institute of Geophysics Department of Earth Sciences ETH-Zurich, Zurich, Switzerland, (3)Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany, (4)ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, (5)ETH Zurich, Zurich, Switzerland, (6)Imperial College London, London, SW7, United Kingdom, (7)Ecole Nationale des Ponts et Chaussées, Champs-sur-Marne, France, (8)Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France, (9)Institut Supérieur de l'Aéronautique et de l'Espace, SSPA/DEOS, Toulouse Cedex 04, France, (10)MPI for Solar System Research, Goettingen, Germany, (11)JPL, Pasadena, CA, United States, (12)Imperial College London, London, United Kingdom, (13)ISAE, INSTITUT SUPERIEUR DE L'AERONAUTIQUE ET DE L'ESPACE, Toulouse, OCCITANIE, France, (14)Institut Superieur de l’Aeronautique et de l’Espace, Toulouse, France, (15)ETH-Zurich, Zurich, Switzerland, (16)Institute of Geophysics, ETH Zurich, Earth Sciences, Zurich, Switzerland, (17)University of Maryland College Park, Geology, College Park, MD, United States, (18)University of Bristol/AWE Blacknest, Bristol, United Kingdom, (19)ETH Zurich, Institute of Geophysics, Zurich, Switzerland, (20)University of Bristol, Bristol, United Kingdom, (21)ETH Zurich, Department of Earth Sciences, Institute of Geophysics, Zurich, Switzerland, (22)CNES French National Center for Space Studies, CST, Toulouse Cedex 09, France, (23)Technical University of Kaiserslautern, Division of Soil Mechanics and Foundation Engineering, Kaiserslautern, Germany, (24)Oxford University, Physics, Oxford, United Kingdom