{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T23:03:09Z","timestamp":1777676589059,"version":"3.51.4"},"reference-count":20,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2015,5,4]],"date-time":"2015-05-04T00:00:00Z","timestamp":1430697600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["The International Journal of High Performance Computing Applications"],"published-print":{"date-parts":[[2016,2]]},"abstract":"<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\u2009km\u2009\u00d7\u2009120\u2009km) was about 5\u2009m. 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>","DOI":"10.1177\/1094342015584090","type":"journal-article","created":{"date-parts":[[2015,5,4]],"date-time":"2015-05-04T22:22:14Z","timestamp":1430778134000},"page":"71-84","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":32,"title":["Large-scale, high-speed tsunami prediction for the Great Nankai Trough Earthquake on the K computer"],"prefix":"10.1177","volume":"30","author":[{"given":"Toshitaka","family":"Baba","sequence":"first","affiliation":[{"name":"Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Japan"},{"name":"Present address: Institute of Technology and Science, The University of Tokushima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuto","family":"Ando","sequence":"additional","affiliation":[{"name":"Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daisuke","family":"Matsuoka","sequence":"additional","affiliation":[{"name":"Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mamoru","family":"Hyodo","sequence":"additional","affiliation":[{"name":"Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takane","family":"Hori","sequence":"additional","affiliation":[{"name":"Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Narumi","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryoko","family":"Obayashi","sequence":"additional","affiliation":[{"name":"Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshiyuki","family":"Imato","sequence":"additional","affiliation":[{"name":"Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dai","family":"Kitamura","sequence":"additional","affiliation":[{"name":"Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hitoshi","family":"Uehara","sequence":"additional","affiliation":[{"name":"Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshihiro","family":"Kato","sequence":"additional","affiliation":[{"name":"NEC Corporation, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryotaro","family":"Saka","sequence":"additional","affiliation":[{"name":"NEC Corporation, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2015,5,4]]},"reference":[{"key":"bibr1-1094342015584090","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-007-7269-4_3"},{"key":"bibr2-1094342015584090","unstructured":"British Oceanographic Data Centre (2010) GEBCO (General Bathymetric Chart of the Oceans). 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