Multiscale and layer-stripping wave-equation dispersion inversion of Rayleigh waves

SUMMARY The iterative wave-equation dispersion inversion can suffer from the local minimum problem when inverting seismic data from complex Earth models. We develop a multiscale, layer-stripping method to alleviate the local minimum problem of wave-equation dispersion inversion of Rayleigh waves and...

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Bibliographic Details
Published in:Geophysical journal international 2019-09, Vol.218 (3), p.1807-1821
Main Authors: Liu, Zhaolun, Huang, Lianjie
Format: Article
Language:English
Subjects:
Earth Sciences
GEOSCIENCES
layer-stripping
multiscale
surface wave
wave-equation dispersion inversion
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Summary:SUMMARY The iterative wave-equation dispersion inversion can suffer from the local minimum problem when inverting seismic data from complex Earth models. We develop a multiscale, layer-stripping method to alleviate the local minimum problem of wave-equation dispersion inversion of Rayleigh waves and improve the inversion robustness. We first invert the high-frequency and near-offset data for the shallow S-velocity model, and gradually incorporate the lower-frequency components of data with longer offsets to reconstruct the deeper regions of the model. We use a synthetic model to illustrate the local minima problem of wave-equation dispersion inversion and how our multiscale and layer-stripping wave-equation dispersion inversion method can mitigate the problem. We demonstrate the efficacy of our new method using field Rayleigh-wave data.
ISSN:0956-540X
1365-246X
DOI:10.1093/gji/ggz215