Christopher James William Carchedi, Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, James B Gaherty, Columbia University in the City of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Eric A Sandvol, University of Missouri , Columbia, Columbia, MO, United States, Patricia Persaud, California Institute of Technology, Pasadena, CA, United States and Michael S Steckler, Lamont-Doherty Earth Obs, Palisades, NY, United States