Charles M. Shobe, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, Georgina Lucy Bennett, University of East Anglia, Norwich, NR4, United Kingdom, Gregory E Tucker, Univ Colorado, Boulder, CO, United States, Kevin Roback, Caltech, Pasadena, United States, Scott R Miller, University of Utah, Salt Lake City, UT, United States and Josh J Roering, University of Oregon, Eugene, OR, United States