{"@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/1361699994652928000.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.epsl.2008.04.039"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X08002914?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X08002914?httpAccept=text/plain"}}],"dc:title":[{"@value":"Regionality of deep low-frequency earthquakes associated with subduction of the Philippine Sea plate along the Nankai Trough, southwest Japan"}],"description":[{"notation":[{"@value":"Abstract   The Fukuoka District Meteorological Observatory recently logged three possible deep low-frequency earthquakes (LFEs) beneath eastern Kyushu, Japan, a region in which LFEs and low-frequency tremors have never before been identified. To assess these data, we analyzed band-pass filtered velocity seismograms and relocated LFEs and regular earthquakes using the double-difference method. The results strongly suggest that the three events were authentic LFEs, each at a depth of about 50 km. We also performed relocation analysis on LFEs recorded beneath the Kii Peninsula and found that these LFEs occurred near the northwest-dipping plate interface at depths of approximately 29–38 km. These results indicate that LFEs in southwest Japan occur near the upper surface of the subducting Philippine Sea (PHS) plate. To investigate the origin of regional differences in the occurrence frequency of LFEs in western Shikoku, the Kii Peninsula, and eastern Kyushu, we calculated temperature distributions associated with PHS plate subduction. Then, using the calculated thermal structures and a phase diagram of water dehydration for oceanic basalt, the water dehydration rate (wt.%/km), which was newly defined in this study, was determined to be 0.19, 0.12, and 0.08 in western Shikoku, the Kii Peninsula, and eastern Kyushu, respectively; that is, the region beneath eastern Kyushu has the lowest water dehydration rate value. Considering that the Kyushu–Palau Ridge that is subducting beneath eastern Kyushu is composed of tonalite, which is low in hydrous minerals, this finding suggests that the regionality may be related to the amount of water dehydration associated with subduction of the PHS plate and/or differences in LFE depths. Notable dehydration reactions take place beneath western Shikoku and the Kii Peninsula, where the depth ranges for dehydration estimated by thermal modeling agree well with those for the relocated LFEs. The temperature range in which LFEs occur in these regions is estimated to be 400–500 °C."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381699994652928001","@type":"Researcher","foaf:name":[{"@value":"Shoichi Yoshioka"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994652928002","@type":"Researcher","foaf:name":[{"@value":"Mamiko Toda"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699994652928000","@type":"Researcher","foaf:name":[{"@value":"Junichi Nakajima"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0012821X"}],"prism:publicationName":[{"@value":"Earth and Planetary Science Letters"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2008-07","prism:volume":"272","prism:number":"1-2","prism:startingPage":"189","prism:endingPage":"198"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0012821X08002914?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0012821X08002914?httpAccept=text/plain"}],"createdAt":"2008-05-13","modifiedAt":"2018-12-28","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050294045368637824","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Contrasting volcano spacing along SW Japan arc caused by difference in age of subducting lithosphere"}]},{"@id":"https://cir.nii.ac.jp/crid/1050294045370471424","@type":"Article","resourceType":"学術雑誌論文(journal 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Kyushu subduction zone, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232468871680","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Stratigraphic variations in lacustrine sediment gravity-flow deposits intercalated in varved diatomite: An example from the Hiruzenbara Formation, Okayama Prefecture, southwest Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232523348480","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Imaging of the subducted Kyushu-Palau Ridge in the Hyuga-nada region, western Nankai Trough subduction zone"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232523516416","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Two-dimensional thermal modeling associated with subduction of the Philippine Sea plate in southern Kyushu, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360013168722329344","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Seismological evidence of a dehydration reaction in the subducting oceanic crust beneath western Shikoku in southwest Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285704777225856","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Structure downdip of deep low‐frequency earthquakes in western Shikoku, Japan, revealed by <i>P</i> and <i>S</i> waves propagating at slow apparent velocities from intraslab earthquakes"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285704777524736","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Seismic attenuation beneath northeastern Japan: Constraints on mantle dynamics and arc 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