Browsing Earth Resources Laboratory by Author "Calandra, Henri"

Now showing items 1-3 of 3

    • 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 ...

    • 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 ...