Michael S Ramsey, University of Pittsburgh, Department of Geology and Environmental Science, Pittsburgh, PA, United States, Matthew Watson, University of Bristol, Earth Sciences, Bristol, United Kingdom, Diego Coppola, Università di Torino, Dipartimento di Scienze della Terra, Turin, Italy, Robert Wright, University of Hawaii HIGP, Honolulu, HI, United States and Rick L Wessels, US Geological Survey, Ashburn, VA, United States