Other 2018 Conférences

30 janvier 2018 ( maj : 26 mars 2018 ), par sandrine nadau

EAGE-HAGI 1st Asia Pacific meeting on Near Surface Geoscience & Engineering, Yogyakarta, Indonesia, 9-13 April

  • 3x3C Seismic’s Sensitivity Analysis on Near-Surface towards Full Waveform Inversion
    IRNAKA, T.M. (ISTerre, Université Grenoble Alpes et Universitas Gadjah Mada, Yogyakarta, Indonesia), R. Brossier (ISTerre, Université Grenoble Alpes), L. Métivier (CNRS, LJK, ISTerre, Université Grenoble Alpes).

SIAM Imaging Science 2018, Bologna, Italy, 5-8 June 2018

  • Accurate discontinuous Galerkin schemes for seismic traveltimes and amplitudes in heterogeneous anisotropic media
    LE BOUTEILLER P. (ISTerre, Université Grenoble Alpes), L. Métivier (CNRS, LJK, ISTerre, Université Grenoble Alpes), J. Virieux (ISTerre, Université Grenoble Alpes)
    Abstract : We design a highly accurate discontinuous-Galerkin-based strategy for computing wave traveltimes and amplitudes in heterogeneous anisotropic media, which is of major interest for a large range of applications in seismics, including seismic imaging. Our strategy, based on a general Hamiltonian formulation, handles complex boundary geometries such as topographies using deformed meshes and suitable radiation boundary conditions. Eikonal and transport equations are solved in order to reconstruct asymptotic Green’s functions and perform Kirchhoff migration.

Image Reconstruction from Millimetres to the Globe : Bridging the Gap Between Seismic and Medical Imaging, Lorentz Center, Leiden, The Netherlands, 25-29 June 2018

  • An accurate Eulerian traveltime computation : application to seismic imaging
    LE BOUTEILLER P. (ISTerre, Université Grenoble Alpes), H. Chauris (Ecole des mines de Paris), L. Métivier (CNRS, LJK, ISTerre, Université Grenoble Alpes), J. Virieux (ISTerre, Université Grenoble Alpes)
    Abstract : Computation of traveltimes and its spatial derivatives is at the core of many seismic imaging techniques. We present recent advances related to anisotropic media with complex topographies, where an efficient and accurate discontinuous Galerkin method for solving the non-linear Eikonal partial differential equation allows us to revisit techniques such as traveltime tomography, stereotomography, and migration. In particular, we draw a comparison between wave-equation based approach and Kirchhoff approach in the least-square migration, making use of the inverse extended Born operator to precondition the process.