{"@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/1363670319526744320.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1046/j.1365-246x.1998.00663.x"}},{"identifier":{"@type":"URI","@value":"http://academic.oup.com/gji/article-pdf/135/3/801/1732032/135-3-801.pdf"}},{"identifier":{"@type":"NAID","@value":"80010727755"}}],"dc:title":[{"@value":"Three-dimensional image of the anisotropic bodies beneath central Honshu, Japan"}],"description":[{"notation":[{"@value":"SUMMARY Shear-wave splitting from local deep earthquakes is investigated to clarify the volume and the location of two anisotropic bodies in the mantle wedge beneath central Honshu, Japan. We observe a spatial variation in splitting parameters depending on the combination of sources and receivers, nearly N‐S fast in the northern region, nearly E‐W fast in the southern region and small time delays in the eastern region. Using forward modelling, two models with 30 and 10 per cent anisotropy are tested by means of a global search for the locations of anisotropic bodies with various volumes. The optimum model is obtained for 30 per cent anisotropy, which means a 5 per cent velocity diVerence between fast and slow polarized waves. The northern anisotropic body has a volume of 1.00° (longitude)◊0.5° (latitude)◊75 km (depth), with the orientation of the symmetry axis being N20°E. The southern anisotropic body has a volume of 1.25°◊1.25°◊100 km with the symmetry axis along N95°E. Our results show that the anisotropic bodies are located in low-velocity and low-Q regions of the mantle. This, together with petrological data and the location of volcanoes in the arc, suggests that the possible cause of the anisotropy is the preferred alignment of cracks filled with melt."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383670319526744321","@type":"Researcher","foaf:name":[{"@value":"Yoshihiro Hiramatsu"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670319526744320","@type":"Researcher","foaf:name":[{"@value":"Masataka Ando"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670319526744323","@type":"Researcher","foaf:name":[{"@value":"Tameshige Tsukuda"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670319526744322","@type":"Researcher","foaf:name":[{"@value":"Tooru Ooida"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0956540X"},{"@type":"EISSN","@value":"1365246X"}],"prism:publicationName":[{"@value":"Geophysical Journal International"}],"dc:publisher":[{"@value":"Oxford University Press (OUP)"}],"prism:publicationDate":"1998-12","prism:volume":"135","prism:number":"3","prism:startingPage":"801","prism:endingPage":"816"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"http://academic.oup.com/gji/article-pdf/135/3/801/1732032/135-3-801.pdf"}],"createdAt":"2003-03-11","modifiedAt":"2023-02-14","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004234589778304","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Upper bounds of seismic anisotropy in the Tonga slab near deep earthquake foci and in the lower mantle"}]},{"@id":"https://cir.nii.ac.jp/crid/1360021391865419392","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"High-resolution three-dimensional azimuthal velocity anisotropy of S-waves in southern-central Japan, based on ambient noise 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zone"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848657355749120","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Regional variations of the shear-wave polarization anisotropy in the crust and mantle wedge beneath the Tohoku district"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204303000832","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Anisotropic Velocity Structure of Seismic Waves in Japan Subduction Zone"},{"@language":"ja","@value":"日本列島の地震波異方性速度構造"},{"@language":"ja-Kana","@value":"ニホン レットウ ノ ジシンハ イホウセイ ソクド コウゾウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206496703232","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"P wave attenuation structure by spectral inversion of seismic waveforms"},{"@language":"ja","@value":"スペクトルインヴァージョンによるP波減衰構造"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206512821504","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Shear-wave splitting analysis of later phases in southwest Japan -A lineament structure detector inside the crust-"},{"@value":"Shear-wave splitting analysis of later phases in southwest Japan —A lineament structure detector inside the crust—"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679281725440","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"K-Ar年代測定に基づく両白山地の鮮新 : 更新世火山活動の時空分布"},{"@language":"en","@value":"Temporal-spatial variations of Plio-Pleistocene volcanic activity in the Ryohaku Mountains, central Japan : evidences from K-Ar ages."},{"@language":"ja-Kana","@value":"K Ar ネンダイ ソクテイ ニ モトズク リョウハク サンチ ノ センシン コウシンセイ カザン カツドウ ノ ジクウ 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