A Comparative Study of Two Large Low Velocity Structures at the Base of the Earth's Mantle

Barbara A Romanowicz1,2, Kaiqing Yuan3, Laura Salmi3 and Sanne Cottaar4, (1)Berkeley Seismological Laboratory, University of California Berkeley, Berkeley, United States, (2)Institut de Physique du Globe de Paris, Collège de France, Paris, France, (3)Berkeley Seismological Lab, Berkeley, CA, United States, (4)University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Abstract: