Analyzing resolution and model uncertainties for ultrasound computed tomography using Hessian information

Ulrich, Ines Elisa; Boehm, Christian; Zunino, Andrea; Fichtner, Andreas

doi:10.1117/12.2608546

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Uncertainty analysis and quantitative comparisons of FWI models continues to be a topic of active research (Flath et al., 2011; Gebraad et al., 2020; Martin et al., 2012; Rawlinson et al., 2014; Ulrich et al., 2022; Zhu et al., 2016). In linearized ray‐based travel time tomography, uncertainty can be assessed through built‐in uncertainty in travel time picks and the computation of model resolution matrices.…”

Section: Introductionmentioning

confidence: 99%

Comparing Adjoint Waveform Tomography Models of California Using Different Starting Models

Afanasiev

Rodgers

Boehm³

et al. 2023

JGR Solid Earth

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Seismic tomography has been a vital tool for understanding Earth's interior structure since studies were first published in the late 1970s (e.g., Aki et al., 1977;Aki & Lee, 1976). Though the theory of Full waveform inversion (FWI) existed, ray-based travel time tomography methods were the primary method of velocity modeling for much of the field's history. Ray-based travel time tomography uses the difference between theoretical and observed arrival times of specified seismic waves to calculate velocity perturbations in the Earth (Dziewonski et al., 1977). Ray-based tomography can be computationally inexpensive but suffers in tectonically complex regions as the physics behind it is unable to resolve effects such as wavefront healing, focusing/defocusing, and other 3D wavefield effects (Liu & Gu, 2012;Rickers et al., 2012;Tarantola, 1984). Unlike ray-based methods, adjoint waveform tomography (AWT) accounts for 3D wavefield effects by solving the elastic wave equation through a given 3D volume, while also considering finite-frequency effects. AWT iteratively optimizes the synthetic data to best match the observed data for available source-receiver pairs. By using the recorded waveform instead of travel times, AWT includes more information (Romanowicz, 2003). AWT has a greater sensitivity to Earth structure than ray-based travel time tomography, enabling greater resolution of tectonic complexity.Uncertainty analysis and quantitative comparisons of FWI models continues to be a topic of active research (Flath et al.

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