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Abstract

Summary

This study presents advances in the elastic multi-parameter full-waveform inversion (FWI) for shallow seismic applications. Rayleigh waves allow the reconstruction of the S-wave structure of the subsurface, whereas refracted P-waves can be used to determine the P-wave velocity. Studies that investigate the upper meters of the subsurface had shown that the amplitudes of Rayleigh waves are much higher than the amplitudes of P-waves. Consequently, FWI fails to reconstruct the correct P-wave velocity model due to its minor dependence on Rayleigh waves which dominate the misfit. We suggest a time-windowed strategy to have higher weight of refracted energy in the early stages of FWI while gradually lowering the weight throughout the inversion process. In a synthetic study we evaluate the performance of our approach and show that it is able to reconstruct the shallow P-wave velocity more accurately and to obtain a good fit of the first arrivals. A better resolved P-wave model then also allows FWI to achieve an improved resolution of the shallow S- wave velocity and density structure.

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/content/papers/10.3997/2214-4609.201801305
2018-06-11
2024-04-16

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References

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Accurate Reconstruction of Shallow P-wave Velocity Model with Time-windowed Elastic Full-waveform Inversion
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201801305
/content/papers/10.3997/2214-4609.201801305
/content/papers/10.3997/2214-4609.201801305
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