A global shear velocity model of the mantle from normal modes, surface waves and body waves

Wednesday, 17 December 2014
Stephanie Durand1, Eric Debayle2, Yanick R Ricard1, Sophie Lambotte3 and Christophe Zaroli4, (1)LGLTPE Laboratoire de Géologie de Lyon : Terre, Planètes et Environnement, Villeurbanne Cedex, France, (2)CNRS, Paris Cedex 16, France, (3)Institut de Physique du Globe Strasbourg, CNRS, Strasbourg Cedex, France, (4)Institut de Physique du Globe Strasbourg, Strasbourg Cedex, France
We present SEISGLOB2, a new global shear-wave velocity model of the mantle. SEISGLOB 2 results from the inversion of all published spheroidal mode splitting and coupling coefficients, completed with new measurements made in Strasbourg, of a large Rayleigh wave dataset measured by Debayle & Ricard (2012) and extended to long periods by Durand et al. (2014), and of a global dataset of S, SS and ScS travel times measured at ≈30 s period by Zaroli et al. (2010). These seismic data are sensitive to 3D heterogeneities of elastic parameters (Vs, Vp, ζ, φ, η in a transversly isotropic medium) and density. We discuss the depth and lateral resolution of our model and compare our results with other global tomographies. Although it is well known that Vs is the best resolved parameter, we also investigate whether our dataset allows to extract additional information on density and/or Vp.