{"created":"2023-03-31T02:09:21.907275+00:00","id":4979,"links":{},"metadata":{"_buckets":{"deposit":"98a7e8b9-bf62-4029-ae98-80458dfa2f01"},"_deposit":{"id":"4979","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"4979"},"status":"published"},"_oai":{"id":"oai:nied-repo.bosai.go.jp:00004979","sets":[]},"author_link":[],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2016-11","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"422","bibliographicPageStart":"411","bibliographicVolumeNumber":"30","bibliographic_titles":[{"bibliographic_title":"The International Journal of High Performance Computing Applications","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"We present high-performance simulations of global seismic wave propagation with an unprecedented accuracy of 1.2?s seismic period for a realistic three-dimensional Earth model using the spectral element method on the K computer. Our seismic simulations use a total of 665.2 billion grid points and resolve 1.8 trillion degrees of freedom. To realize these large-scale computations, we optimize a widely used community software code to efficiently address all hardware parallelization, especially thread-level parallelization to solve the bottleneck of memory usage for coarse-grained parallelization. The new code exhibits excellent strong scaling for the time stepping loop, that is, parallel efficiency on 82,134 nodes relative to 36,504 nodes is 99.54%. Sustained performance of these computations on the K computer is 1.24 petaflops, which is 11.84% of its peak performance. The obtained seismograms with an accuracy of 1.2?s for the entire globe should help us to better understand rupture mechanisms of devastating earthquakes.","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"SAGE Publications","subitem_publisher_language":"en"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1177/1094342016632596"}}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1741-2846","subitem_source_identifier_type":"EISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Seiji Tsuboi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Kazuto Ando","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Takayuki Miyoshi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Daniel Peter","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Dimitri Komatitsch","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Jeroen Tromp","creatorNameLang":"en"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_title":"A 1.8 trillion degrees-of-freedom, 1.24 petaflops global seismic wave simulation on the K computer","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A 1.8 trillion degrees-of-freedom, 1.24 petaflops global seismic wave simulation on the K computer","subitem_title_language":"en"}]},"item_type_id":"40001","owner":"1","path":["1670839190650"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-30"},"publish_date":"2023-03-30","publish_status":"0","recid":"4979","relation_version_is_last":true,"title":["A 1.8 trillion degrees-of-freedom, 1.24 petaflops global seismic wave simulation on the K computer"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-08T06:13:48.252584+00:00"}