{"@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/1360004233292295808.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018jb016649"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB016649"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018JB016649"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB016649"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Crustal Extension and Graben Formation by Fault Slip‐Associated Pore Opening, Kyushu, Japan"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Crustal extension in graben takes place by normal (+strike‐slip) faulting, yet the physical processes involved are poorly understood. A series of shallow large earthquakes struck the Kumamoto area of Kyushu, Japan, in 2016. The <jats:italic>M</jats:italic><jats:sub><jats:italic>w</jats:italic></jats:sub>7.0 main shock was a slip along the southern boundary of the Beppu‐Shimabara Graben, where NS‐extensional crustal deformation is now taking place. We conducted a tomographic inversion for crustal <jats:italic>P</jats:italic> and <jats:italic>S</jats:italic> velocities and Poisson's ratio (<jats:italic>V</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub>, <jats:italic>V</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub>, and σ) in Kyushu. The most outstanding feature in this region is a Beppu‐Shimabara Graben‐parallel belt of low <jats:italic>V</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub> and <jats:italic>V</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub> anomalies at depths of the upper crust. We find that within the belt <jats:italic>dV</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub>/<jats:italic>V</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub> ≈ <jats:italic>dV</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub>/<jats:italic>V</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub> (<0) in marked contrast to relations in other low‐velocity regions where |<jats:italic>dV</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub>/<jats:italic>V</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub>| > |<jats:italic>dV</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub>/<jats:italic>V</jats:italic><jats:sub><jats:italic>p</jats:italic></jats:sub>|. This observation can be interpreted as due to water‐saturated, oblate‐spheroid pores with either of two very different geometries: one almost round pore and the other very flat pore. We calculate 3‐D density anomaly distributions and 2‐D gravity anomaly profiles for these two pore models. The gravity anomaly map calculated for spherical pores shows a significant negative anomaly belt that spatially agrees with observed Bouguer anomaly map. The spatial agreement is very poor if pores are modeled as flat. This and extensive seismicity within Beppu‐Shimabara Graben imply significance of fault‐associated round pore formation in the process of graben opening. Seismic tomography combined with gravity and poroeasticty analyses can constrain the crack/pore state of extensionally deforming crust.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004233292295553","@type":"Researcher","foaf:name":[{"@value":"Zhi Wang"}],"jpcoar:affiliationName":[{"@value":"CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology Chinese Academy of Sciences  Guangdong Guangzhou China"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233292295683","@type":"Researcher","foaf:name":[{"@value":"Yoshio Fukao"}],"jpcoar:affiliationName":[{"@value":"CEAT Japan Agency for Marine‐Earth Science and Technology  Yokohama Kanagawa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233292295552","@type":"Researcher","foaf:name":[{"@value":"Ayumu Miyakawa"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan AIST  Tsukuba Ibaraki Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233292295424","@type":"Researcher","foaf:name":[{"@value":"Akira Hasegawa"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics Tohoku University  Sendai Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233292295555","@type":"Researcher","foaf:name":[{"@value":"Yasuko Takei"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute University of Tokyo  Tokyo Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699313"},{"@type":"EISSN","@value":"21699356"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2019-05","prism:volume":"124","prism:number":"5","prism:startingPage":"4879","prism:endingPage":"4894"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://creativecommons.org/licenses/by-nc-nd/4.0/"],"url":[{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB016649"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018JB016649"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB016649"}],"createdAt":"2019-04-11","modifiedAt":"2023-09-07","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282256935363328","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17H05321"},{"@type":"JGN","@value":"JP17H05321"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PUBLICLY-17H05321/"}],"notation":[{"@language":"ja","@value":"海溝型巨大地震の最大規模推定に資する地質構造の強度推定"},{"@language":"en","@value":"Strength of the geological structures for evaluation of the 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