Eric Beauce, Massachusetts Institute of Technology, Cambridge, MA, United States, Glenn Cougoulat, University Joseph Fourier Grenoble, ISTerre, Grenboble, France, Piero Poli, CNRS, Grenoble Cedex 9, France, Leonard Seydoux, Université Grenoble Alpes, Grenoble, France, Robert D van der Hilst, Massachusetts Institute of Technology, Cambridge, United States and Michel Campillo, ISTerre Institute of Earth Sciences, CNRS, Université Grenoble Alpes, Saint Martin d'Hères, France