Accelerating numerical wave propagation by wavefield adapted meshes, Part II: Full-waveform inversion
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Date
2020-06
Publication Type
Journal Article
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yes
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Abstract
We present a novel full-waveform inversion (FWI) approach which can reduce the computational cost by up to an order of magnitude compared to conventional approaches, provided that variations in medium properties are sufficiently smooth. Our method is based on the usage of wavefield adapted meshes which accelerate the forward and adjoint wavefield simulations. By adapting the mesh to the expected complexity and smoothness of the wavefield, the number of elements needed to discretize the wave equation can be greatly reduced. This leads to spectral-element meshes which are optimally tailored to source locations and medium complexity. We demonstrate a workflow which opens up the possibility to use these meshes in FWI and show the computational advantages of the approach. We provide examples in 2-D and 3-D to illustrate the concept, describe how the new workflow deviates from the standard FWI workflow, and explain the additional steps in detail.
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published
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Journal / series
Volume
221 (3)
Pages / Article No.
1591 - 1604
Publisher
Oxford University Press
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Edition / version
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Software
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Date collected
Date created
Subject
Seismic tomography; Waveform inversion; Computational seismology
Organisational unit
03971 - Fichtner, Andreas / Fichtner, Andreas
03476 - Giardini, Domenico / Giardini, Domenico
Notes
Funding
823844 - Centre of Excellence for Exascale in Solid Earth (EC)
Related publications and datasets
Continues: https://doi.org/10.3929/ethz-b-000402305