HR: 1340h
AN: DI53A-1098    [Abstracts]
TI: Global Imaging of Upper Mantle Seismic Heterogeneities and Discontinuities From Observations of Body-Wave Travel-Times and Rayleigh Wave Dispersion.
AU: Debayle, E
EM: Eric.Debayle@eost.u-strasbg.fr
AF: Institut de Physique du Globe de Strasbourg, Centre National de la Recherche Scientifique et Universite Louis Pasteur, 5 rue Rene Descartes, Strasbourg, 67084, France
AU: * Tauzin, B
EM: Benoit.Tauzin@eost.u-strasbg.fr
AF: Institut de Physique du Globe de Strasbourg, Centre National de la Recherche Scientifique et Universite Louis Pasteur, 5 rue Rene Descartes, Strasbourg, 67084, France
AU: Wittlinger, G
EM: Gerard.Wittlinger@eost.u-strasbg.fr
AF: Institut de Physique du Globe de Strasbourg, Centre National de la Recherche Scientifique et Universite Louis Pasteur, 5 rue Rene Descartes, Strasbourg, 67084, France
AB: The tomographic inversion of 100779 Rayleigh waveforms including higher modes has recently allowed us to constrain the SV-wave heterogeneities in the upper mantle with a lateral resolution of a few hundred kilometers and a vertical resolution of a few tens of kilometers. We are currently working to improve the resolution of our model in the transition zone by increasing the number and the accuracy of the higher modes measurements. In addition to the large-scale constraints provided by surface-waves on the 3D distribution of shear-wave velocities, we have accumulated global observations on the topography of the 410-km and 660-km discontinuities through the measurement of arrival times of converted and reflected body-wave phases. SS precursors phases can efficiently complete the analysis of P-to-s receiver functions to build a global image of the topography of the transition zone seismic discontinuities. We present results obtained from the separate analysis of each type of body-wave dataset. We are currently working on the simultaneous inversion of body waves and surface waves higher modes for the 3D distribution of SV-wave velocities and the depth of seismic discontinuities. We discuss the strategy for the inversion and present our preliminary results.
DE: 7203 Body waves
DE: 7208 Mantle (1212, 1213, 8124)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 8124 Earth's interior: composition and state (1212, 7207, 7208, 8105)
DE: 8137 Hotspots, large igneous provinces, and flood basalt volcanism
SC: Study of the Earth's Deep Interior [DI]
MN: 2007 Fall Meeting