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- W2333601045 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2014Comparison of grid-based methods for raytracing on unstructured meshesAuthors: Bernard Giroux*Bernard Giroux*INRS-ETESearch for more papers by this authorhttps://doi.org/10.1190/segam2014-1197.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The relative advantages and disadvantages of the fast marching (FMM), fast sweeping (FSM) and shortest-path methods (SPM) for raytracing on unstructured meshes are examined. The SPM implementation relies on secondary nodes to improve accuracy. Measurements are performed on 2D triangular and 3D tetrahedral meshes. In all cases, the SPM with a high number of secondary nodes (up to 9) yields the highest accuracy. In 2D, the computational cost of the SPM might be compensated in tomography problems where the raytracing routine is called for multiple sources with the same grid. In 3D, a small number of secondary nodes (1 or 2) can be used with the SPM to achieve accuracy comparable or better than the FMM and FSM, at better computational cost. Keywords: algorithm, ray tracing, traveltimePermalink: https://doi.org/10.1190/segam2014-1197.1FiguresReferencesRelatedDetailsCited ByA hybrid approach to compute seismic travel times in three‐dimensional tetrahedral meshes27 February 2020 | Geophysical Prospecting, Vol. 68, No. 4 SEG Technical Program Expanded Abstracts 2014ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2014 Pages: 5183 publication data© 2014 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 05 Aug 2014 CITATION INFORMATION Bernard Giroux*, (2014), Comparison of grid-based methods for raytracing on unstructured meshes, SEG Technical Program Expanded Abstracts : 3388-3392. https://doi.org/10.1190/segam2014-1197.1 Plain-Language Summary Keywordsalgorithmray tracingtraveltimePDF DownloadLoading ..." @default.
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