Bryndis Brandsdottir, Institute of Earth Sciences, Science Institute, Univ. Iceland, Reykjavik, Iceland, Robert S White, Univ Cambridge, Cambridge, United Kingdom, Thorbjorg Agustsdottir, University of Cambridge, Bullard Laboratories - Department of Earth Sciences, Cambridge, United Kingdom, Tom Winder, University of Cambridge, Cambridge, United Kingdom, Jonathan Daniel Smith, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Conor Andrew Bacon, Bullard Laboratories, Department of Earth Sciences, Cambridge, United Kingdom and Benjamin Ricciardi--Larrodé, École et Observatoire des Sciences de la Terre, Université de Strasbourg, Strasbourg, France