{"@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/1361137043968612608.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.epsl.2017.01.003"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X17300092?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X17300092?httpAccept=text/plain"}}],"dc:title":[{"@value":"Seismic structure off the Kii Peninsula, Japan, deduced from passive- and active-source seismographic data"}],"description":[{"notation":[{"@value":"Abstract   We conduct seismic tomography to model subsurface seismicity between 2010 and 2012 and structural heterogeneity off the Kii Peninsula, southwestern Japan, and to investigate their relationships with segmentation of the Nankai and Tonankai seismogenic zones of the Nankai Trough. In order to constrain both the shallow and deep structure of the offshore seismogenic segments, we use both active- and passive-source data recorded by both ocean-bottom seismometers and land seismic stations. The relocated microearthquakes indicate a lack of seismic activity in the Tonankai seismogenic segment off Kumano, whereas there was active intraslab seismicity in the Kii Channel area of the Nankai seismogenic segment. Based on comparisons among the distribution of seismicity, age, and spreading rate of the subducting Philippine Sea plate, and the slip-deficit distribution, we conclude that seismicity in the subducting slab under the Kii Channel region nucleated from structures in the Philippine Sea slab that pre-date subduction and that fluids released by dehydration are related to decreased interplate coupling of these intraslab earthquakes. Our velocity model clearly shows the areal extent of two key structures reported in previous 2-D active-source surveys: a high-velocity zone beneath Cape Shionomisaki and a subducted seamount off Cape Muroto, both of which are roughly circular and of 15–20 km radius. The epicenters of the 1944 Tonankai and 1946 Nankai earthquakes are near the edge of the high-velocity body beneath Cape Shionomisaki, suggesting that this anomalous structure is related to the nucleation of these two earthquakes. We identify several other high- and low-velocity zones immediately above the plate boundary in the Tonankai and Nankai seismogenic segments. In comparison with the slip-deficit model, some of the low-velocity zones appear to correspond to an area of strong coupling. Our observations suggest that, unlike the Japan Trench subduction zone, in our study area there is not a simple correspondence between areas of large coseismic slip or strong interplate coupling and areas of high velocity in the overriding plate."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381137043968612611","@type":"Researcher","foaf:name":[{"@value":"Yojiro Yamamoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137043968612609","@type":"Researcher","foaf:name":[{"@value":"Tsutomu Takahashi"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137043968612614","@type":"Researcher","foaf:name":[{"@value":"Yuka Kaiho"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137043968612608","@type":"Researcher","foaf:name":[{"@value":"Koichiro Obana"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137043968612612","@type":"Researcher","foaf:name":[{"@value":"Ayako Nakanishi"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137043968612613","@type":"Researcher","foaf:name":[{"@value":"Shuichi Kodaira"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137043968612610","@type":"Researcher","foaf:name":[{"@value":"Yoshiyuki Kaneda"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0012821X"}],"prism:publicationName":[{"@value":"Earth and Planetary Science Letters"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2017-03","prism:volume":"461","prism:startingPage":"163","prism:endingPage":"175"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0012821X17300092?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0012821X17300092?httpAccept=text/plain"}],"createdAt":"2017-01-19","modifiedAt":"2018-09-04","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050289532527693952","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Geometrical dependence on the stress and slip tendency acting on the subduction megathrust of Nankai seismogenic zone off Kumano"},{"@value":"Geometrical dependence on the stress and slip tendency acting on the subduction megathrust of the Nankai seismogenic zone off Kumano"}]},{"@id":"https://cir.nii.ac.jp/crid/1360009142888763008","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Slow Earthquakes Illuminating Interplate Coupling Heterogeneities in Subduction Zones"}]},{"@id":"https://cir.nii.ac.jp/crid/1360025030626632064","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Seismic activity around shallow plate boundary near westernmost Nankai Trough revealed by ocean bottom seismometer observation"}]},{"@id":"https://cir.nii.ac.jp/crid/1360298760960737280","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Spatiotemporal variations of shallow very low frequency earthquake activity southeast off the Kii Peninsula, along the Nankai Trough, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360576118691375232","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Sedimentary Structure Derived From Multi‐Mode Ambient Noise Tomography With Dense OBS Network at the Japan Trench"}]},{"@id":"https://cir.nii.ac.jp/crid/1360861294960273280","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Nankai Forearc Structural and Seismogenic Segmentation Caused by a Magmatic Intrusion off the Kii Peninsula"}]},{"@id":"https://cir.nii.ac.jp/crid/1360861711972426112","@type":"Article","resourceType":"学術雑誌論文(journal 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