Browsing ERL Industry Consortia Technical Reports by Author "Demanet, Laurent"

Now showing items 1-6 of 6

    • Approximate inversion of the wave-equation Hessian via randomized matrix probing 

      Letourneau, Pierre-David; Demanet, Laurent; Calandra, Henri (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
      We present a method for approximately inverting the Hessian of full waveform inversion as a dip-dependent and scale-dependent amplitude correction. The terms in the expansion of this correction are determined by least-squares ...

    • The failure mode of correlation focusing for model velocity estimation 

      Baek, Hyoungsu; Calandra, Henri; Demanet, Laurent (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      We analyze the correlation focusing objective functional introduced by van Leeuwen and Mulder to avoid the cycle-skipping problem in full waveform inversion. While some encouraging numerical experiments were reported in ...

    • A fast butterfly algorithm for the hyperbolic Radon transform 

      Hu, Jingwei; Fomel, Sergey; Demanet, Laurent; Ying, Lexing (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
      We introduce a fast butterfly algorithm for the hyperbolic Radon transform commonly used in seismic data processing. For two-dimensional data, the algorithm runs in complexity O(N[superscript 2] logN), where N is representative ...

    • High-dimensional wave atoms and compression of seismic datasets 

      Leinonen, Matti; Hewett, Russell J.; Zhang, Xiangxiong; Ying, Lexing; Demanet, Laurent (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      Wave atoms are a low-redundancy alternative to curvelets, suitable for high-dimensional seismic data processing. This abstract extends the wave atom orthobasis construction to 3D, 4D, and 5D Cartesian arrays, and parallelizes ...

    • Registration-guided least-squares waveform inversion 

      Baek, Hyoungsu; Calandra, Henri; Demanet, Laurent (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013-01-15)
      Full waveform inversion with frequency sweeping cannot start from zero frequency because of the lack of low-frequency data, requiring a good starting model. We study a di fferent iterative scheme where the notion of proximity ...

    • Time-stepping beyond CFL: a locally one-dimensional scheme for acoustic wave propagation 

      Zepeda Nunez, Leonardo Andres; Hewett, Russell J.; Rao, Minghua Michel; Demanet, Laurent (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      In this abstract, we present a case study in the application of a time-stepping method, unconstrained by the CFL condition, for computational acoustic wave propagation in the context of full waveform inversion. The numerical ...