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Visco-acoustic full waveform seismic inversion: from a DG forward solver to a Newton-CG inverse solver

Bohlen, Thomas; Fernandez, Mario Ruben; Ernesti, Johannes; Rheinbay, Christian; Rieder, Andreas; Christian, Wieners

Abstract:
In this paper we present a holistic framework for full waveform inversion (FWI) in the visco-acoustic regime. FWI entails the reconstruction of material parameters (such as
density and sound speed) from measurements of reflected wave fields (seismograms). We derive a discontinuous Galerkin (DG) solver for the visco-acoustic wave equation and incorporate it into an inverse solver. For the DG discretization we provide a block diagonal preconditioner for the efficient computation of the time steps by GMRES which yields a convergence estimate in space and time. Numerical tests illustrate these results. Furthermore, we set up an inverse solver of well established Newton-CG type, and we express the required Fréchet derivative and its adjoint in the DG setting. Reconstructions from simulated cross-well seismograms highlight the challenges of FWI and demonstrate the performance of the scheme. Some of the inversion experiments use seismograms generated by an independent FDTD forward solver to avoid an inverse crime.

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Volltext §
DOI: 10.5445/IR/1000105695
Veröffentlicht am 07.02.2020
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
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2365-662X
KITopen-ID: 1000105695
Verlag KIT, Karlsruhe
Umfang 29 S.
Serie CRC 1173 ; 2020/4
Projektinformation SFB 1173/2 (DFG, DFG KOORD, SFB 1173/2 2019)
Externe Relationen Siehe auch
Schlagwörter full waveform inversion, Newton-CG, CG-REGINN, discontinuous Galerkin, discretization, inverse crime
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