{"@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/1360004232173783296.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.gr.2008.12.010"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1342937X0800186X?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1342937X0800186X?httpAccept=text/plain"}},{"identifier":{"@type":"NAID","@value":"20000877766"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Tomographic imaging of hydrated crust and mantle in the subducting Pacific slab beneath Hokkaido, Japan: Evidence for dehydration embrittlement as a cause of intraslab earthquakes"}],"description":[{"notation":[{"@value":"Abstract   We estimate detailed three-dimensional seismic velocity structures in the subducting Pacific slab beneath Hokkaido, Japan, using a large number of arrival-time data from 6902 local earthquakes. A remarkable low-velocity layer with a thickness of ~ 10 km is imaged at the uppermost part of the slab and is interpreted as hydrated oceanic crust. The layer gradually disappears at depths of 70–80 km, suggesting the breakdown of hydrous minerals there. We find prominent low-velocity anomalies along the lower plane of the double seismic zone and above the aftershock area of the 1993 Kushiro-oki earthquake (M7.8). Since seismic velocities of unmetamorphosed peridotite are much higher than the observations, hydrous minerals are expected to exist in the lower plane as well as the hypocentral area of the 1993 earthquake. On the other hand, regions between the upper and lower planes, where seismic activity is not so high compared to the both planes, show relatively high velocities comparable to those of unmetamorphosed peridotite. Our observations suggest that intermediate-depth earthquakes occur mainly in regions with hydrous minerals, which support dehydration embrittlement hypothesis as a cause of earthquake in the subducting slab."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420845751160606592","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"30361067"},{"@type":"NRID","@value":"1000030361067"},{"@type":"NRID","@value":"9000002427899"},{"@type":"NRID","@value":"9000254262653"},{"@type":"NRID","@value":"9000257916804"},{"@type":"NRID","@value":"9000331096686"},{"@type":"NRID","@value":"9000018699099"},{"@type":"NRID","@value":"9000254263590"},{"@type":"NRID","@value":"9000238038282"},{"@type":"NRID","@value":"9000001756845"},{"@type":"NRID","@value":"9000279888035"},{"@type":"NRID","@value":"9000254741159"},{"@type":"NRID","@value":"9000002108619"},{"@type":"NRID","@value":"9000014235008"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0200817"}],"foaf:name":[{"@value":"Junichi Nakajima"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232173783297","@type":"Researcher","foaf:name":[{"@value":"Yusuke Tsuji"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232173783300","@type":"Researcher","foaf:name":[{"@value":"Akira Hasegawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232173783299","@type":"Researcher","foaf:name":[{"@value":"Saeko Kita"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326219191680","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"30281968"},{"@type":"NRID","@value":"1000030281968"},{"@type":"ORCID","@value":"0000-0002-0334-279X"},{"@type":"NRID","@value":"9000020970954"},{"@type":"NRID","@value":"9000254262646"},{"@type":"NRID","@value":"9000254262652"},{"@type":"NRID","@value":"9000284268603"},{"@type":"NRID","@value":"9000254741781"},{"@type":"NRID","@value":"9000254262900"},{"@type":"NRID","@value":"9000254262643"},{"@type":"NRID","@value":"9000410904518"},{"@type":"NRID","@value":"9000410320352"},{"@type":"NRID","@value":"9000000119743"},{"@type":"NRID","@value":"9000001212862"},{"@type":"NRID","@value":"9000408484407"},{"@type":"NRID","@value":"9000005191168"},{"@type":"NRID","@value":"9000254741743"},{"@type":"NRID","@value":"9000001212872"},{"@type":"NRID","@value":"9000023611239"},{"@type":"NRID","@value":"9000409470223"},{"@type":"NRID","@value":"9000258414494"},{"@type":"NRID","@value":"9000018699101"},{"@type":"NRID","@value":"9000388538969"},{"@type":"NRID","@value":"9000008300536"},{"@type":"NRID","@value":"9000018369126"},{"@type":"NRID","@value":"9000238038283"},{"@type":"NRID","@value":"9000254741829"},{"@type":"NRID","@value":"9000279888034"},{"@type":"NRID","@value":"9000254741756"},{"@type":"NRID","@value":"9000254708737"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0211901"}],"foaf:name":[{"@value":"Tomomi Okada"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232173783296","@type":"Researcher","foaf:name":[{"@value":"Toru Matsuzawa"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"1342937X"}],"prism:publicationName":[{"@value":"Gondwana Research"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2009-12","prism:volume":"16","prism:number":"3-4","prism:startingPage":"470","prism:endingPage":"481"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/","https://www.elsevier.com/legal/tdmrep-license","https://doi.org/10.15223/policy-017","https://doi.org/10.15223/policy-037","https://doi.org/10.15223/policy-012","https://doi.org/10.15223/policy-029","https://doi.org/10.15223/policy-004"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S1342937X0800186X?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S1342937X0800186X?httpAccept=text/plain"}],"createdAt":"2009-01-03","modifiedAt":"2025-10-22","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282257039539456","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21109002"},{"@type":"JGN","@value":"JP21109002"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-21109002/"}],"notation":[{"@language":"ja","@value":"地震波で診る地殻流体"},{"@language":"en","@value":"Geofluid investigated from seismic waves"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282257071435904","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21740318"},{"@type":"JGN","@value":"JP21740318"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740318/"}],"notation":[{"@language":"ja","@value":"地震学的観測に基づく西南日本下のマントル上昇流の実体解明とそのテクトニクス的意義"},{"@language":"en","@value":"Study on a mantle upwelling in southwestern Japan and its tectonic implications"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001202726471680","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Three-dimensional structure of V_p, V_s, and V_p/V_s beneath northeastern Japan: Implications for arc magmatism and fluids"}]},{"@id":"https://cir.nii.ac.jp/crid/1050001202746187904","@type":"Article","resourceType":"学術雑誌論文(journal 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