{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360004236702637440.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1177/1094342015584090"}},{"identifier":{"@type":"URI","@value":"https://journals.sagepub.com/doi/pdf/10.1177/1094342015584090"}},{"identifier":{"@type":"URI","@value":"https://journals.sagepub.com/doi/full-xml/10.1177/1094342015584090"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Large-scale, high-speed tsunami prediction for the Great Nankai Trough Earthquake on the K computer"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p> We improved the tsunami simulation code JAGURS, which is a paralleled version of URSGA code for a large-scale, high-speed tsunami prediction in the Nankai trough, Japan. We optimized the loop kernel for velocity update and intergrid communication on a three-dimensional torus network. Linear scaling was achieved up to the full system capability of the K computer (82,944 nodes) in a strong scaling test that used 100 billion finite-difference grid points. The measured performance on the K computer was 1.2 petaflops (11.5% of peak speed). Intergrid communication was optimized for a three-nested-grid model consisting of 0.68 billion grid points. Grid spacing in the area with the finest grid (180 km × 120 km) was about 5 m. We successfully implemented a large-scale tsunami simulation using this model that ran in about 30% of real time. We believe that this is the fastest tsunami prediction achieved to date with such a large-scale model. Our code can provide high-resolution tsunami prediction for broad regions within a reasonable time to assist emergency rescue and relief operations during future devastating tsunamis comparable to the 2004 Sumatra, 2010 Chile, and 2011 Tohoku tsunamis. </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004236702637444","@type":"Researcher","foaf:name":[{"@value":"Toshitaka Baba"}],"jpcoar:affiliationName":[{"@value":"Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Japan"},{"@value":"Present address: Institute of Technology and Science, The University of Tokushima, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004236702637442","@type":"Researcher","foaf:name":[{"@value":"Kazuto Ando"}],"jpcoar:affiliationName":[{"@value":"Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, 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for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004236702637569","@type":"Researcher","foaf:name":[{"@value":"Toshihiro Kato"}],"jpcoar:affiliationName":[{"@value":"NEC Corporation, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004236702637441","@type":"Researcher","foaf:name":[{"@value":"Ryotaro Saka"}],"jpcoar:affiliationName":[{"@value":"NEC Corporation, Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"10943420"},{"@type":"EISSN","@value":"17412846"}],"prism:publicationName":[{"@value":"The International Journal of High Performance Computing Applications"}],"dc:publisher":[{"@value":"SAGE 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