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Improved full-waveform inversion of normalised seismic wavefield data  

Kim, Hee-Joon (Department of Environmental Exploration Engineering, Pukyong National University)
Matsuoka, Toshifumi (Department of Civil and Earth Resource Engineering, Kyoto University)
Publication Information
Geophysics and Geophysical Exploration / v.9, no.1, 2006 , pp. 86-92 More about this Journal
Abstract
The full-waveform inversion algorithm using normalised seismic wavefields can avoid potential inversion errors due to source estimation required in conventional full-waveform inversion methods. In this paper, we have modified the inversion scheme to install a weighted smoothness constraint for better resolution, and to implement a staged approach using normalised wavefields in order of increasing frequency instead of inverting all frequency components simultaneously. The newly developed scheme is verified by using a simple two-dimensional fault model. One of the most significant improvements is based on introducing weights in model parameters, which can be derived from integrated sensitivities. The model-parameter weighting matrix is effective in selectively relaxing the smoothness constraint and in reducing artefacts in the reconstructed image. Simultaneous multiple-frequency inversion can almost be replicated by multiple single-frequency inversions. In particular, consecutively ordered single-frequency inversion, in which lower frequencies are used first, is useful for computation efficiency.
Keywords
crosshole; full waveform; tomography; normalised wavefield; sensitivities;
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