{"@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/1363670320275445888.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2004jb003036"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2004JB003036"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2004JB003036"}}],"dc:title":[{"@value":"Variation of physical properties beneath a fault observed by a two‐ship seismic survey off southwest Japan"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>We conducted a two‐ship seismic reflection survey at Kumano‐nada off the southwest Japan arc, in 2002, in order to clarify physical properties along a splay fault that branches from the plate boundary of the Nankai Trough subduction zone. During the survey, seismic reflection data were collected out to maximum offset of 20 km using multiple passes of a shooting and a receiving vessel separated by a different constant offset on each pass. We conducted analyses on reflection polarity and amplitude variation with offset (AVO) effects to examine physical properties of layers immediately beneath the splay fault. Reflections from the splay fault showed varying polarities along the fault. In the present study, we assumed that the Poisson's ratio of the layer above the fault was 0.30–0.40. Where polarity is reversed, the Poisson's ratio of the layer immediately below the fault was estimated to be 0.33–0.445 (11% increase on average). Where polarity was normal, the ratio was estimated to be 0.263–0.365 (11% decrease on average). If the reverse polarity indicates the existence of fluid as many authors suggest, the polarity analysis demonstrates inhomogeneous distribution of fluid in the splay fault shear zone. The results of AVO analysis also support the possibility of the spatial variation of fluid distribution under some assumptions because the Poisson's ratio changes with content of fluid in rocks. The variation in reflection polarity and corresponding AVO effects may signify the possibility of localized fluid migration in the splay fault shear zone.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383670320275445760","@type":"Researcher","foaf:name":[{"@value":"Tetsuro Tsuru"}],"jpcoar:affiliationName":[{"@value":"Center for Data and Sample Analyses, Institute for Frontier Research on Earth Evolution, Yokomaha Institute for Earth Sciences Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198018","@type":"Researcher","foaf:name":[{"@value":"Seiichi Miura"}],"jpcoar:affiliationName":[{"@value":"Center for Data and Sample Analyses, Institute for Frontier Research on Earth Evolution, Yokomaha Institute for Earth Sciences Japan Agency for Marine‐Earth Science and Technology  Yokosuka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198021","@type":"Researcher","foaf:name":[{"@value":"Jin‐Oh Park"}],"jpcoar:affiliationName":[{"@value":"Program for Plate Dynamics, Institute for Frontier Research on Earth Evolution, Yokomaha Institute for Earth Sciences Japan Agency for Marine‐Earth Science and Technology  Yokohama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198016","@type":"Researcher","foaf:name":[{"@value":"Aki Ito"}],"jpcoar:affiliationName":[{"@value":"Program for Plate Dynamics, Institute for Frontier Research on Earth Evolution, Yokomaha Institute for Earth Sciences Japan Agency for Marine‐Earth Science and Technology  Yokohama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198019","@type":"Researcher","foaf:name":[{"@value":"Gou Fujie"}],"jpcoar:affiliationName":[{"@value":"Program for Plate Dynamics, Institute for Frontier Research on Earth Evolution, Yokomaha Institute for Earth Sciences Japan Agency for Marine‐Earth Science and Technology  Yokohama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198020","@type":"Researcher","foaf:name":[{"@value":"Yoshiyuki Kaneda"}],"jpcoar:affiliationName":[{"@value":"Program for Plate Dynamics, Institute for Frontier Research on Earth Evolution, Yokomaha Institute for Earth Sciences Japan Agency for Marine‐Earth Science and Technology  Yokohama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198022","@type":"Researcher","foaf:name":[{"@value":"Tetsuo No"}],"jpcoar:affiliationName":[{"@value":"Marine Science Department Nippon Marine Enterprises, Ltd.  Yokohama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198017","@type":"Researcher","foaf:name":[{"@value":"Takeshi Katayama"}],"jpcoar:affiliationName":[{"@value":"Marine Science Department Nippon Marine Enterprises, Ltd.  Yokohama Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380016867034198023","@type":"Researcher","foaf:name":[{"@value":"Junzo Kasahara"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute University of Tokyo  Tokyo Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2005-05","prism:volume":"110","prism:number":"B5","prism:startingPage":"B05405"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2004JB003036"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2004JB003036"}],"createdAt":"2005-05-20","modifiedAt":"2023-10-12","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001202178685312","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"VP∕VS ratio and shear-wave splitting in the Nankai Trough seismogenic zone: Insights into effective stress, pore pressure, and sediment consolidation"},{"@value":"<i>V</i>\n                    P/\n                    <i>V</i>\n                    S ratio and shear-wave splitting in the Nankai Trough seismogenic zone: Insights into effective stress, pore pressure, and sediment consolidation"},{"@value":"Seismic interferometry using multidimensional deconvolution and crosscorrelation for crosswell seismic reflection data without borehole sources"},{"@value":"<i>V</i><sub>P</sub>/<i>V</i><sub>S</sub> ratio and shear-wave splitting in the Nankai Trough seismogenic zone: Insights into effective stress, pore pressure, and sediment consolidation"},{"@value":"Vp/Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone: insights into effective stress, pore pressure and sediment consolidation"},{"@value":"Vp/Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone: insight into effective stress, pore pressure, and sediment consolidation"}]},{"@id":"https://cir.nii.ac.jp/crid/1050845760762900352","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Small-scale stress fluctuations in borehole breakouts and their implication in identifying potential active faults around the seismogenic megasplay fault, Nankai Trough, SW Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004229800450944","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Contrasts in physical properties between the hanging wall and footwall of an exhumed seismogenic megasplay fault in a subduction zone—An example from the Nobeoka Thrust Drilling Project"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232135547264","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"3D geometry of a plate boundary fault related to the 2016 Off-Mie earthquake in the Nankai subduction zone, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004235528098304","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Acoustic properties of deformed rocks in the <scp>N</scp>obeoka thrust, in the <scp>S</scp>himanto <scp>B</scp>elt, <scp>K</scp>yushu, <scp>S</scp>outhwest <scp>J</scp>apan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285704780066944","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Structure and lithology of the Japan Trench subduction plate boundary fault"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2004jb003036"},{"@type":"OPENAIRE","@value":"doi_dedup___::e921a8482535eb9618c2d2d4c550f9db"},{"@type":"CROSSREF","@value":"10.1190/1.3560018_references_DOI_I8fKyoGFLAglHK5LgxcktoXSkGm"},{"@type":"CROSSREF","@value":"10.1002/2013gc004818_references_DOI_I8fKyoGFLAglHK5LgxcktoXSkGm"},{"@type":"CROSSREF","@value":"10.1111/iar.12198_references_DOI_I8fKyoGFLAglHK5LgxcktoXSkGm"},{"@type":"CROSSREF","@value":"10.1002/2014tc003695_references_DOI_I8fKyoGFLAglHK5LgxcktoXSkGm"},{"@type":"CROSSREF","@value":"10.1186/s40623-014-0176-9_references_DOI_I8fKyoGFLAglHK5LgxcktoXSkGm"},{"@type":"CROSSREF","@value":"10.1016/j.epsl.2017.08.041_references_DOI_I8fKyoGFLAglHK5LgxcktoXSkGm"}]}