Pascal Buri¹, Robert S Anderson², Leif Anderson³, William H Armstrong Jr⁴ and Martin Truffer¹, (1)University of Alaska Fairbanks, Geophysical Institute, Fairbanks, AK, United States, (2)INSTAAR and Department of Geological Sciences, Boulder, CO, United States, (3)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (4)Appalachian State University, Geological and Environmental Sciences, Boone, NC, United States