WUS324: Multiscale Full Waveform Inversion Approaching Convergence Improves Waveform Fits While Imaging Seismic Structure of the Western United States

Rodgers, A. J.; Doody, C. D.; Fichtner, A.

doi:10.1029/2024GL110911

WUS324: Multiscale Full Waveform Inversion Approaching Convergence Improves Waveform Fits While Imaging Seismic Structure of the Western United States

Journal Article · Fri Oct 25 00:00:00 EDT 2024 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2024GL110911· OSTI ID:2474185

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Lawrence Livermore National Laboratory Geophysical Monitoring Program Livermore CA USA, Department of Earth Sciences Eidgenössische Technische Hochschule Zürich Switzerland
Lawrence Livermore National Laboratory Geophysical Monitoring Program Livermore CA USA
Department of Earth Sciences Eidgenössische Technische Hochschule Zürich Switzerland

Abstract

We report a new model of radially anisotropic crustal and upper mantle structure of the western United States (WUS324) obtained from full waveform inversion of earthquake data. We ran three multiscale inversion stages beyond model WUS256 (Rodgers et al., 2022, https://doi.org/10.1029/2022jb024549 ) allowing them to approach convergence to fit a larger data set to a shorter minimum period of 16 s. WUS324 is based on 324 total iterations from its starting model, significantly more (16 times) than previous studies. Waveform misfit reductions are 66%–70% for both the inversion data and an independent validation data set providing confidence in the predictive power of the model. WUS324 provides much better fits and reveals shear wavespeed, v _S , structure of this large region with more detail than previous waveform tomography models. We show representative images demonstrating the resolution of diverse seismic structure across this highly heterogeneous region including oceanic lithosphere, subducting slabs and continental magmatism.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2474185

Alternate ID(s):: OSTI ID: 2483857

Report Number(s):: LLNL--JRNL-865738; e2024GL110911

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 20 Vol. 51; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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