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Multiparameter viscoelastic full waveform inversion of shallow seismic surface waves with a preconditioned truncated-Newton method

Gao, Lingli; Pan, Yudi; Rieder, Andreas; Bohlen, Thomas

Abstract:
2D full waveform inversion (FWI) of shallow seismic Rayleigh waves has become a powerful method for reconstructing viscoelastic multiparameter models of shallow subsurface with high resolution. The multiparameter reconstruction in FWI is challenging due to the potential presence of crosstalk between different parameters and the unbalanced sensitivity of Rayleigh-wave data with respect to different parameter classes. Accounting for the inverse Hessian using truncated Newton methods based on second-order adjoint methods provides as an effective tool to mitigate crosstalk caused by the coupling between different parameters.
In this study, we apply a preconditioned truncated Newton method (PTN) to shallow-seismic FWI to simultaneously invert for multiparameters near-surface models (P- and S-wave velocities, attenuation of P and S waves, and density). We firstly investigate scattered wavefields caused by these parameters to evaluate the coupling between them. Then we investigate the performance of PTN on shallow-seismic FWI of Rayleigh wave for reconstructing all five parameters simultaneously. The application to spatially correlated and uncorrelated models demonstrate that PTN helps to mitigate the crosstalk and improves the resolution of the multiparameter reconstructions, especially for the weak parameters with small sensitivity such as attenuation and density parameters. ... mehr

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Volltext §
DOI: 10.5445/IR/1000131530
Veröffentlicht am 16.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Institut für Angewandte und Numerische Mathematik (IANM)
Sonderforschungsbereich 1173 (SFB 1173)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 04.2021
Sprache Englisch
Identifikator ISSN: 2365-662X
KITopen-ID: 1000131530
Verlag Karlsruher Institut für Technologie (KIT)
Umfang 22 S.
Serie CRC 1173 Preprint ; 2021/15
Projektinformation SFB 1173/2 (DFG, DFG KOORD, SFB 1173/2 2019)
Externe Relationen Siehe auch
Schlagwörter inverse theory, waveform inversion, surface wave
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