William H Armstrong Jr, Appalachian State University, Geological and Environmental Sciences, Boone, NC, United States, Martin Truffer, University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States, David Polashenski, Dartmouth College, Hanover, NH, United States, Anthony M Hengst, Appalachian State University, Department of Geological and Environmental Sciences, Boone, NC, United States and Hannah Field, Appalachian State University, Boone, NC, United States