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• W2890777354 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Surface-wave tomography for near-surface characterization with continuous-wavelet transform for two-station crosscorrelationAuthors: Tatsunori IkedaTakeshi TsujiTatsunori IkedaWPI-I2CNER, Kyushu UniversitySearch for more papers by this author and Takeshi TsujiDepartment of Earth Resources Engineering, Kyushu UniversityWPI-I2CNER, Kyushu UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2996939.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractThe multichannel analysis of surface waves (MASW) is the most popular approach to estimate dispersion curves of surface waves for near-surface S-wave velocity characterization. The MASW is robust because fundamental mode of surface waves could be distinguished from noise such as body waves or higher modes in the frequency-wavenumber domain. However, sharp lateral variation is difficult to accurately retrieve by MASW-based approach. We proposed a workflow to effectively estimate lateral variation of shallow subsurface from surface-wave tomography using active-source seismic data. In our approach, we stacked cross-coherence between two stations from different shot data to improve the stability of phase velocity estimation. We then applied continuous wavelet transform (CWT) for cross-coherence data to reduce the influence of noise by applying a time-domain filter. Lateral variation of phase velocities was finally estimated from dispersion curves between two stations by tomography. Numerical experiments demonstrated that our CWT-based approach could be used to accurately estimate phase velocity between two stations reflecting lateral variation of the simulated model. The lateral boundary could be well retrieved in the velocity model estimated by tomography. Application of our approach to field data indicated the high stability of phase velocity estimation between two stations and tomography analysis, compared to conventional MASW-based approach.Presentation Date: Tuesday, October 16, 2018Start Time: 8:30:00 AMLocation: 204A (Anaheim Convention Center)Presentation Type: OralKeywords: surface wave, tomography, near surface, shallow, 2DPermalink: https://doi.org/10.1190/segam2018-2996939.1FiguresReferencesRelatedDetailsCited byCommon‐midpoint cross‐correlation stacking tomography: A 3D approach for frequency‐dependent mapping of Rayleigh waves, group and phase velocity throughout an active seismic network29 December 2022 | Near Surface Geophysics, Vol. 21, No. 1Surface-wave phase velocity tomography using active-source seismic dataTatsunori Ikeda and Takeshi Tsuji 29 April 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 Tatsunori Ikeda and Takeshi Tsuji, (2018), Surface-wave tomography for near-surface characterization with continuous-wavelet transform for two-station crosscorrelation, SEG Technical Program Expanded Abstracts : 2531-2535. https://doi.org/10.1190/segam2018-2996939.1 Plain-Language Summary Keywordssurface wavetomographynear surfaceshallow2DPDF DownloadLoading ..." @default.
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• W2890777354 title "Surface-wave tomography for near-surface characterization with continuous-wavelet transform for two-station crosscorrelation" @default.
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