*Simon C Staehler^1,2, Steven Vance³, Mark Panning⁴, Sharon Kedar³, Sridhar Anandakrishnan¹¹, W. Bruce Banerdt³, Bruce G. Bills³, Fabio Cammarano⁵, Julie C. Castillo³, Hsin-Hua Huang^6,7, Philippe H. Lognonne⁸, Jennifer Jackson⁶, Ralph D. Lorenz⁹, William T. Pike¹⁰, Victor Tsai⁶ (1.Ludwig Maximilians University of Munich, Germany, 2.Leibniz-Institute for Baltic Sea Research, Rostock, Germany, 3.Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA, United States, 4.University of Florida, Gainsville, United States, 5.U. Roma Tre, Rome, Italy, 6.California Institute of Technology, Pasadena CA, United States, 7.Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, 8.Institut de Physique du Globe de Paris, Paris, France, 9.Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, 10.Imperial College London, London, SW7, United Kingdom, 11.Pennsylvania State University Main Campus, University Park, PA, United States)