Stable discontinuous staggered-grid finite difference for an elastic wave propagations and its implementations on GPU platform

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2016Stable discontinuous staggered-grid finite difference for an elastic wave propagations and its implementations on GPU platformAuthors: Shiying NieYongfei WangShiying NieSan Diego State UniversitySearch for more papers by this author and Yongfei WangUCSDSearch for more papers by this authorhttps://doi.org/10.1190/segam2016-13954922.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We present a 3-D fourth-order velocity-stress staggered grids finite-difference method using discontinuous grids modeling anelastic seismic wave propagation. Because the grid spacing is significantly restricted by minimum regional velocity, our algorithm, on one hand, consists fine grids where the wave speed is low, on the other hand, allows larger grid spacing (the ratio between coarser and finer grid spacing can be any odd number) in higher speed region. To avoid the instability due to numerical noise generated by downsamping and interpolation at the overlap of two regions which have different grid sizes, we develop a weekly enforced discontinuous grid interface elements(WEDGIE) as a downsampling method. This velocity adapted method can significantly reduce the computational requirements without an evident loss of accuracy and stability. Moreover, especially in more realistically anelastic medium, the instabilities can seen evitable. In the end, with the implementation of multiple high performance computing techniques e.g. MPI, OpenMP on GPU platform, the originally huge resources required for over 1Hz full waveforms in Los Angeles basin can be additionally significantly reduced and the program. Presentation Date: Wednesday, October 19, 2016 Start Time: 2:20:00 PM Location: 161 Presentation Type: ORAL Keywords: elastic, modeling, wave propagation, 3D, earthquakePermalink: https://doi.org/10.1190/segam2016-13954922.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2016ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2016 Pages: 5654 publication data© 2016 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 01 Sep 2016 CITATION INFORMATION Shiying Nie and Yongfei Wang, (2016), "Stable discontinuous staggered-grid finite difference for an elastic wave propagations and its implementations on GPU platform," SEG Technical Program Expanded Abstracts : 3910-3914. https://doi.org/10.1190/segam2016-13954922.1 Plain-Language Summary Keywordselasticmodelingwave propagation3DearthquakePDF DownloadLoading ...