Now showing items 1-5 of 5

    • Effects of surface scattering in full-waveform inversion 

      Bleibinhaus, Florian; Rondenay, Stephane (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009-12-17)
      In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. Asynthetic study was performed to investigate the effects of this simplification. In terms of ...
    • Efficient stochastic Hessian estimation for full waveform inversion 

      Willemsen, Lucas Abraham; Malcolm, Alison E.; Hewett, Russell J. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      In this abstract we present a method that allows arbitrary elements of the approximate Hessian to be estimated simultaneously. Preliminary theoretical and numerical investigations suggest that the number of forward models ...
    • 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 ...
    • Target-oriented Time-lapse Waveform Inversion using Virtual Survey 

      Yang, Di; Zheng, Yingcai; Fehler, Michael; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
      Time-lapse seismic data are widely used for monitoring time-variant subsurface changes. Conventional analysis provides qualitative information by comparing results from consecutive surveys, whereas waveform inversion can ...