Towards "box tomography" of ultra-low velocity zones at the earth’s core-mantle boundary

Chao Lyu, University of California Berkeley, Berkeley, CA, United States, Hengyi Su, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, United States, Carl Martin, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, Yder Masson, INRIA, Bordeaux, France and Barbara Romanowicz, Collège de France, IPGP, UNIVERSITY OF BERKELEY, Paris, France