GÉLIS , Céline

Imaging the soil physical parameters with surface seismic recordings is a non linear inverse problem. The elastic full waveform inversion is a quantitative multiparameters imaging method of diffractors that requires beforehand the knowledge of an initial velocity model. The corresponding forward problem, the elastic waves propagation, is solved...

We perform the full elastic waveform inversion in the frequency domain in a 2-D geometry. This method allows imaging of two physical seismic parameters, using vertical and horizontal field components. The forward problem is discretized using finite difference, allowing to simulate the full elastic wavefield propagation. Moreover, it is solved...

We present a high-order discontinuous Galerkin method for the simulation of P-SV seismic wave propagation in heterogeneous media and two dimensions of space. The first-order velocity-stress system is obtained by assuming that the medium is linear, isotropic and viscoelastic, thus considering intrinsic attenuation. The associated stress-strain...

This paper discusses about the development of a high-order discontinuous Galerkin method for viscoelastic wave propagation.

This paper discusses about the development of a high-order discontinuous Galerkin method for viscoelastic wave propagation.

We present a discontinuous Galerkin method for site effects assessment. The P-SV seismic wave propagation is studied in 2-D space heterogeneous media. The first-order velocity-stress system is obtained by assuming that the medium is linear, isotropic and viscoelastic, thus considering intrinsic attenuation. The associated stress-strain relation...

A method is proposed for accurately describing arbitrary-shaped free boundaries in single-grid finite-difference schemes for elastodynamics, in a time-domain velocity-stress framework. The basic idea is as follows: fictitious values of the solution are built in vacuum, and injected into the numerical integration scheme near boundaries. The most...

"international colloquium « Seismic Risk 2008 - Earthquakes in North-Western Europe » organised in Liege on 11 and 12 September 2008 by the Belgian Seismic Group (BeSeiG) EAN : 9782874560637

A new stable and accurate, finite-difference 2D elastic seismic wave propagation modeling algorithm is developed, with a Perfectly Matched Layer (PML) absorbing boundary condition to avoid reflections from the edges of the numerical model. This is used to study the interaction of seismic surface waves with near-surface heterogeneities. The...