[PDF] Top 20 Waveform inversion based on wavefield decomposition

... The short wavelengths provide the ine structure of the subsurface model, allowing to lo- calize relectors in depth. The short wavelengths can be obtained by migration techniques, assuming the background velocity is ... Voir le document complet

... 4.4 Inversion of baseline data The initial model used to invert the baseline data is a smoothed version of the true model (second column of ...tomography based on ray ...the waveform contains only ... Voir le document complet

... elastic waveform inversion in the frequency domain in a 2-D ...non-linear inversion is based on a pre-conditioned gradient method, where Born and Rytov formulations are used to compute ... Voir le document complet

... Full-waveform Inversion for Imaging Piecewise Media Hossein ...Abstract—Full waveform inversion (FWI) is an iterative nonlin- ear waveform matching procedure, which seeks to reconstruct ... Voir le document complet

... is based on a realistic ...the inversion scheme for all the following experiments, which results in a reduction of the parameter space and a stabilization of the problem: since these parameters are close ... Voir le document complet

... double-scattered wavefield ∂ pp u s (p) and the residuals R s u s (p) − d s ...multiscattered wavefield for this test case is weak, and the l-BFGS method is ... Voir le document complet

... elastic waveform inversion in the frequency domain in a 2-D ...non-linear inversion is based on a pre-conditioned gradient method, where Born and Rytov formulations are used to compute ... Voir le document complet

... Bilinearity allows us to recast the parameter estimation sub- problem as a linear subproblem and hence the waveform inversion as a biconvex problem. Although ADMM has been originally de- veloped to solve ... Voir le document complet

... to obtain the right rates of convergence in L p norms. The paper is structured as follows. In Section 2 we introduce the model and the Radon transform Singular Value Decomposition. In Section 3 we give the class ... Voir le document complet

... full-waveform inversion, crosshole, ...ray-based inversion methods for ground penetrating radar (GPR) data [1], the full-waveform inversion (FWI) of crosshole GPR data has shown ... Voir le document complet

... dierent from the GPR characterization scale (order of 2500 cm 2 ), and this is in relation to the inherent heterogeneity. The mean condence interval at 95%, calculated for each mix of humid sand, is equal to 0.010. ... Voir le document complet

... Figure 5 shows the waveform inversion result of the baseline, 2008 data. The velocity update to the starting model for the inversion of the 2009 data is displayed in the left panel of Fig- ure 6. It ... Voir le document complet

... Schwarz Waveform Relaxation (SWR) algorithm is proposed to solve by Domain Decomposition Method (DDM) linear and nonlinear Schr¨ odinger ...Schwarz Waveform Relaxation (OSWR) algorithms are ... Voir le document complet

... 203 Once the gradient is computed, different algorithms can be used to solve the inversion system, from the steepest descent to the full 204 Newton method (Virieux and Operto, 2009). This issue is not the focus of ... Voir le document complet

... traveltime inversion to the model of Fig. 11(b). Usually, traveltime inversion is only applied as a preliminary step to waveform inver- sion (Pratt 1999; Pratt & Shipp 1999) but the strong ... Voir le document complet

... reference Process 27 0.6% Convert/control Mix 27 0.6% Transmit Why is this reduction in the number of verbs so sought after? Stone, Wood and researchers who use Hirtz’ functional base wanted to increase the number of ... Voir le document complet

... Figure 2. a) Original signal, b) Flat dilation/erosion based Morphological Empirical Mode (1.7) with a disk of λ = 5, c) Quadratic dilation/erosion based Morphological Empirical Mode (2.3) with λ = 3. ... Voir le document complet

... 5 C O N C L U S I O N The viscoacoustic tomography presented in this paper provides the attenuation Q-factor and velocity of heterogeneities without any trade-off between the two classes of parameters. To verify these ... Voir le document complet

... Generalized Decomposition methods, are considered when solving at-hand partial differential equations by employing procedures based on the separation of ... Voir le document complet

... Generalized Decomposition can obtain 3D solutions while keeping the 2D complexity of 2D shell ...technique, based on the Domain Decomposition technique, that is able to generate complex geometries ... Voir le document complet