{"@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/1361699994531029632.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.epsl.2005.01.015"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X05000506?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X05000506?httpAccept=text/plain"}}],"dc:title":[{"@value":"High strain rate zone in central Honshu resulting from the viscosity heterogeneities in the crust and mantle"}],"description":[{"notation":[{"@value":"Abstract   A linear zone with high strain rates along the backarc side of central Honshu (the so-called Niigata–Kobe Tectonic Zone) has been revealed by the dense GPS array (GEONET) operated by the Geographical Survey Institute of Japan. In order to explore the origin of this zone, we examine rheological heterogeneities in the crust or mantle above a subducting slab, which possibly contribute to the high strain rates. We calculate velocity profiles at the surface of the upper plate due to loading and unloading of the subducting Philippine Sea plate using a 2-dimensional finite element method. From the numerical experiments, we find that the high strain rates can be reproduced by viscosity heterogeneities either in the crust or the mantle. If viscosity heterogeneity in the crust is an origin, the conditions to be satisfied are (i) an effective elastic thickness of 5 km for short-term loading (10 2 –10 3  yr), (ii) a low viscosity ( 19  Pa s) in the lower crust beneath the zone, with a normal viscosity (>10 21  Pa s) in the ambient lower crust, and (iii) a uniform viscosity of 10 19  Pa s in the upper mantle. On the other hand, if viscosity heterogeneity in the mantle is an origin, the conditions to be satisfied are (i) an effective elastic thickness of ∼30 km for short-term loading, (ii) a low viscosity (∼10 18  Pa s) at least down to a depth of 60 km in the zone and to a depth of 10 km further seaward below the Moho depth, and (iii) a viscosity of 10 20  Pa s in the ambient mantle. The crust heterogeneity model contradicts the 15-km cut-off depth of intraplate seismicity and the ∼20-km effective elastic thickness previously inferred from gravity and topography in central Honshu. The fact that Quaternary active faults and intraplate earthquakes are not particularly concentrated in the zone also favours the mantle viscosity heterogeneity model. Thus, we prefer the mantle heterogeneity model. We suggest that upward movement of water dehydrated from the subducting Philippine Sea and Pacific plates, partial melting of the mantle above the Pacific plate, and serpentinization in the wedge mantle above the Philippine Sea plate are possible origins of the low viscous upper mantle. Possible low viscosities in the upper mantle wedge presented in this study seem to provide important constraints for subduction processes of oceanic plates and strain accumulation processes in the upper plate."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381699994531029632","@type":"Researcher","foaf:name":[{"@value":"Tadashi Yamasaki"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994531029633","@type":"Researcher","foaf:name":[{"@value":"Tetsuzo Seno"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0012821X"}],"prism:publicationName":[{"@value":"Earth and Planetary Science Letters"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2005-03","prism:volume":"232","prism:number":"1-2","prism:startingPage":"13","prism:endingPage":"27"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0012821X05000506?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0012821X05000506?httpAccept=text/plain"}],"createdAt":"2005-02-21","modifiedAt":"2023-05-02","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282810751851392","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"On-land active thrust faults of the Nankai–Suruga subduction zone: The Fujikawa-kako Fault Zone, central Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1050293710890939264","@type":"Article","resourceType":"学術雑誌論文(journal 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southwest Japan: Constraints from geophysical and geochemical findings"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204303055616","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"The Process by Which Intraplate Earthquakes Are Generated"},{"@language":"ja","@value":"内陸地震の発生過程"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206512915328","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Diffusion of crustal deformation from disturbances arising at plate boundaries"},{"@value":"Diffusion of crustal deformation from disturbances arising at plate boundaries—a case of the detachment beneath the Izu Peninsula, central Honshu, Japan—"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001277392978688","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Modeling Deformation and Stress States in the Island-arc Crust Considering Heterogeneous Rheological Structure"},{"@language":"ja","@value":"不均質レオロジー構造を考慮した島弧地殻における変形と応力場のモデル化"},{"@language":"ja-Kana","@value":"フキンシツ レオロジー コウゾウ オ コウリョ シタ トウコ チカク ニ オケル ヘンケイ ト オウリョクジョウ ノ モデルカ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679279780608","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Seismotectonics of the Japanese Islands Based on GPS Observation"},{"@language":"ja","@value":"GPS観測に基づく日本列島の地震テクトニクス"}]},{"@id":"https://cir.nii.ac.jp/crid/1390564237990897152","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"地殻変動からマグマ溜まりを推論する"},{"@language":"en","@value":"Crustal Deformation Infers a Magma Chamber"},{"@language":"ja-Kana","@value":"チカク ヘンドウ カラ マグマ タマリ オ スイロン 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