Sara Martinez-Loriente, Institut de Ciències del Mar - CSIC, Barcelona, Spain, Valenti Sallares, Institute of Marine Sciences - CSIC, Barcelona, Spain, Cesar Ranero, ICREA at CSIC, Barcelona, Spain, Jonas B Ruh, Geological institute, ETH Zurich, Zurich, Switzerland, Udo Barckhausen, Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany, Ingo Grevemeyer, GEOMAR, Kiel, Germany, Nathan L Bangs, Univ Texas, Institute for Geophysics, Austin, TX, United States and Eulàlia Gràcia, CMIMA-CSIC, Barcelona, Spain