Evidence for a Significant Level of Extrinsic Anisotropy Due to Heterogeneities in the Mantle.

ChloƩ Alder1, Thomas Bodin2, Yanick R Ricard2, Yann Capdeville3, Eric Debayle2 and Jean-Paul Montagner4, (1)LGLTPE, Univ. Lyon 1, ENS Lyon, Lyon, France, (2)LGLTPE, Univ. Lyon 1, ENS Lyon and CNRS, Lyon, France, (3)LPG Nantes and CNRS, Nantes, France, (4)Institut de Physique du Globe de Paris, Paris, France