Curtis D Williams¹, Sujoy Mukhopadhyay², Maxwell L Rudolph¹ and Barbara A Romanowicz^3,4, (1)University of California Davis, Department of Earth and Planetary Sciences, Davis, CA, United States, (2)University of California Davis, Davis, MA, United States, (3)University of California Berkeley, Department of Earth and Planetary Science, Berkeley, CA, United States, (4)Institut de Physique du Globe de Paris, Paris, France