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- W2016555105 abstract "We propose a new waveform inversion method to improve the accuracy of the near surface velocity structure. Only the first-arrival waveform is used in this method to decrease the nonlinearity between wavefield and model parameters and the dependency of waveform inversion on the starting model. To increase the computational efficiency of forward calculation, we use Gaussian Beam (GB) method to calculate the Green function and the first-arrival wavefield. To avoid the storage of the huge Frechet matrix, based on Born wavepath, we propose the calculation of the direction and step length in waveform inversion using matrix decomposition, accomplished by accumulation. We then apply this new first-arrival waveform inversion method on a numerical experiment. The comparisons between this method and traditional acoustic full waveform inversion (FWI) and ray-based first-arrival traveltime tomography (RFTT) show that it can obtain a result a little worse than FWI while much better than traditional RFTT, while the computational efficiency is almost the same as RFTT. Meanwhile, the dependence of this method on the starting model is much weaker than FWI." @default.
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- W2016555105 date "2014-09-01" @default.
- W2016555105 modified "2023-09-22" @default.
- W2016555105 title "Gaussian Beam First-Arrival Waveform Inversion Based on Born Wavepath" @default.
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- W2016555105 doi "https://doi.org/10.1002/cjg2.20128" @default.
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