Sophie Coulson¹, Jacqueline Austermann², Mark Hoggard³, Fred Richards¹, Marisa Julia Borreggine¹ and Jerry X Mitrovica¹, (1)Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States, (2)Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (3)Harvard University, Department of Earth and Planetary Sciences, Cambridge, United States