Pritwiraj Moulik, University of Maryland College Park, Department of Geology, College Park, MD, United States, Vedran Lekic, University of Maryland, Department of Geology, College Park, MD, United States, Goran Ekstrom, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States and Barbara A Romanowicz, Univ California Berkeley, Berkeley, CA, United States