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• W2890439587 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Wave-equation Rayleigh wave inversion using fundamental and higher modesAuthors: Zhen-dong ZhangTariq AlkhalifahZhen-dong ZhangKing Abdullah University of Science and TechnologySearch for more papers by this author and Tariq AlkhalifahKing Abdullah University of Science and TechnologySearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2989655.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractRecorded surface waves often provide reasonable estimates of the Shear wave velocity in the near surface. However, these estimates tend to be low in resolution considering that they depend on dispersion nature of the fundamental mode of surface waves. We present a surface-wave inversion method that inverts for the S-wave velocity from the fundamental- and higher-modes of Rayleigh waves. The proposed method aims to maximize the similarity of the phase velocity (f−v) spectrum of the surface waves with all-Rayleigh wave modes (if they exist) in the inversion. The f−v spectrum is calculated using the linear Radon transform and by using a local similarity-based objective function, we do not need to pick velocities in the spectrum plots. Thus, the best match between the predicted and observed data f−v spectrum provides the optimal estimation of S-wave velocity. We derive the gradient of the proposed objective function using the adjoint-state method and solve the optimization problem using the LBFGS method. Our method can invert for lateral velocity variations, include all-mode dispersions, and mitigate the local minimum problem in full waveform inversion with a reasonable computation cost. Results with synthetic and field data illustrate the benefits and limitations of this method.Presentation Date: Tuesday, October 16, 2018Start Time: 8:30:00 AMLocation: 204A (Anaheim Convention Center)Presentation Type: OralKeywords: elastic, rayleigh wave, dispersion, full-waveform inversionPermalink: https://doi.org/10.1190/segam2018-2989655.1FiguresReferencesRelatedDetailsCited byConcurrent elastic inversion of Rayleigh and body waves with interleaved envelope-based and waveform-based misfit functions28 February 2023 | Exploration Geophysics, Vol. 69Near-surface S-wave velocity estimation using ambient noise from fiber-optic acquisitionZhen-dong Zhang, Mamdoh Alajami, and Tariq Alkhalifah10 August 2019Near-surface S-wave velocity estimation using ambient noise from fiber-optic acquisitionZhen-dong Zhang, Mamdoh Alajami, and Tariq Alkhalifah10 August 2019 SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Zhen-dong Zhang and Tariq Alkhalifah, (2018), Wave-equation Rayleigh wave inversion using fundamental and higher modes, SEG Technical Program Expanded Abstracts : 2511-2515. https://doi.org/10.1190/segam2018-2989655.1 Plain-Language Summary Keywordselasticrayleigh wavedispersionfull-waveform inversionPDF DownloadLoading ..." @default.
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