{"@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/1360005518171998976.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018jb017135"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JB017135"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB017135"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018JB017135"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB017135"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Offshore Postseismic Deformation of the 2011 Tohoku Earthquake Revisited: Application of an Improved GPS‐Acoustic Positioning Method Considering Horizontal Gradient of Sound Speed Structure"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>One of the important issues on the GPS‐acoustic (GPS‐A) observation for sea bottom positioning is how to address the horizontal heterogeneity of the sound speed in oceans. This study presents an analysis method of GPS‐A data in the presence of a sloping sound speed structure. By applying this method and revising the analysis scheme to make full use of existing data, we reevaluated the horizontal postseismic deformations occurring ~1.5–5 years after the 2011 Tohoku earthquake. The revised horizontal movements have more uniform directions and rates between neighboring sites, suggesting enhancement of the array positioning accuracy. The revised displacement rate of the site on the incoming Pacific plate, located ~100 km northeast of the main rupture zone, was decreased significantly; it was only slightly, by 1.4 cm/year larger than the global motion of the Pacific plate, suggesting a relatively small effect of viscoelastic relaxation. The horizontal movements of the near‐trench sites above the main rupture zone were generally landward and were significantly faster than the Pacific plate motion, indicating a viscoelastic relaxation of 5–10 cm/year. The distribution of the fast landward movements peaked near 38°N at an updip of the mainshock hypocenter and extended significantly farther to the north than to the south. This implies the existence of a secondary coseismic slip patch in the northern area in addition to a primary slip patch at ~38°N. The occurrence of episodic slow slip in early 2015 to the north of the main rupture zone was also verified from the GPS‐A analyses.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380005518171999104","@type":"Researcher","foaf:name":[{"@value":"C. Honsho"}],"jpcoar:affiliationName":[{"@value":"Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University  Sendai Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518171999107","@type":"Researcher","foaf:name":[{"@value":"M. Kido"}],"jpcoar:affiliationName":[{"@value":"International Research Institute of Disaster Science Tohoku University  Sendai Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518171999106","@type":"Researcher","foaf:name":[{"@value":"F. Tomita"}],"jpcoar:affiliationName":[{"@value":"Graduate School of Science Hokkaido University  Sapporo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518171999108","@type":"Researcher","foaf:name":[{"@value":"N. Uchida"}],"jpcoar:affiliationName":[{"@value":"Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University  Sendai 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":"2019-06","prism:volume":"124","prism:number":"6","prism:startingPage":"5990","prism:endingPage":"6009"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JB017135"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB017135"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2018JB017135"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB017135"}],"createdAt":"2019-05-10","modifiedAt":"2023-09-06","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781830451328","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15H04228"},{"@type":"JGN","@value":"JP15H04228"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15H04228/"}],"notation":[{"@language":"ja","@value":"海底地殻変動と海水温変動の高精度検出に向けた統合解析：高密度海域観測網の新活用"},{"@language":"en","@value":"Integral analysis of ocean bottom pressure change due to crustal deformation and oceanic depth profile change: New application of dense sealfoor networks"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781844885248","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15K05260"},{"@type":"JGN","@value":"JP15K05260"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15K05260/"}],"notation":[{"@language":"ja","@value":"日本海溝海底地震津波観測網を用いた浅部プレート境界の非地震性すべり過程の解明"},{"@language":"en","@value":"Study on aseismic slip on the shallow plate interface by the S-net cabled seismometers"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256879561344","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"16H06473"},{"@type":"JGN","@value":"JP16H06473"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-16H06473/"}],"notation":[{"@language":"ja","@value":"海陸機動的観測に基づくスロー地震発生様式の解明"},{"@language":"en","@value":"Study on the Mechanisms Ivolved in the Occurrence of Slow Earthquakes Based on Temporal Inland and Offshore Observations"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256952474880","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17KK0081"},{"@type":"JGN","@value":"JP17KK0081"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17KK0081/"}],"notation":[{"@language":"ja","@value":"米国および世界の繰り返し地震による浅部プレート境界非地震性すべりの普遍的性質解明"},{"@language":"en","@value":"The elucidation of the nature of shallow interplate aseismic slip based on repeating earthquakes in United States and in the world"}]},{"@id":"https://cir.nii.ac.jp/crid/1040566775626660096","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19H05596"},{"@type":"JGN","@value":"JP19H05596"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H05596/"}],"notation":[{"@language":"ja","@value":"巨大地震の裏側～巨大化させないメカニズム"},{"@language":"en","@value":"Head and tail of massive earthquakes: Mechanism arresting growth of interpolate earthquakes"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050013474495795840","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"A review on slow earthquakes in the Japan Trench"}]},{"@id":"https://cir.nii.ac.jp/crid/1050564285766891264","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Afterslip and viscoelastic relaxation following the 2011 Tohoku-oki earthquake (Mw9.0) inferred from inland GPS and seafloor GPS/Acoustic data"},{"@value":"Afterslip and viscoelastic relaxation following the 2011 Tohoku-oki earthquake (<i>M<sub>w</sub></i>9.0) inferred from inland GPS and seafloor GPS/Acoustic data"},{"@value":"Afterslip and viscoelastic relaxation following the 2011 Tohoku earthquake (Mw9.0) inferred from inland GPS and seafloor GPS/Acoustic 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Trench"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137046071659904","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Speed of sound in seawater at high pressures"}]},{"@id":"https://cir.nii.ac.jp/crid/1361699995574436608","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"ITRF2008: an improved solution of the international terrestrial reference frame"}]},{"@id":"https://cir.nii.ac.jp/crid/1361981471335460736","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Speed of sound in seawater as a function of salinity, temperature, and pressure"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544420969788288","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Preceding seismic activity and slow slip events in the source area of the 2011 Mw 9.0 Tohoku-Oki earthquake: a 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