{"@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/1362262944761217536.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018jb015620"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JB015620"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB015620"}}],"dc:title":[{"@value":"Geodetically Inferred Locking State of the Cascadia Megathrust Based on a Viscoelastic Earth Model"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>In a viscoelastic Earth, stresses slowly built up due to fault locking are relaxed concurrently during the entire interseismic period. This interseismic stress relaxation causes crustal deformation much farther away from the locked fault than can be explained using elastic models that neglect the relaxation. Here we develop a viscoelastic geodetic inversion model to address this problem at Cascadia. We invert ~500 horizontal velocity vectors based on continuous and campaign geodetic measurements over the past two decades. Ambiguities arising from long‐term rotation of upper‐plate crustal blocks are addressed by test‐correcting the geodetic velocities with two different block‐motion models. Fault back slip (i.e., slip deficit) Green's functions are derived using a Maxwell viscoelastic finite element model with realistic subduction zone structure and megathrust geometry. The preferred model features a narrow and shallow megathrust locked zone, consistent with earlier thermorheological reasoning. For an elastic model to fit the data to the same fidelity, megathrust locking has to extend to much greater depths. However, even with the viscoelastic model, the land‐based geodetic data still cannot resolve whether there is some creep (incomplete locking) in the shallowest part of the megathrust far offshore. Neither can the land data fully resolve along‐strike variations of the locking state. These ambiguities can be resolved only when adequate seafloor geodetic data are obtained.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382262944761217664","@type":"Researcher","foaf:name":[{"@value":"Shaoyang Li"}],"jpcoar:affiliationName":[{"@value":"Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences  Potsdam Germany"},{"@value":"Now at Department of Earth and Environmental Sciences University of Iowa  Iowa City IA USA"}]},{"@id":"https://cir.nii.ac.jp/crid/1382262944761217666","@type":"Researcher","foaf:name":[{"@value":"Kelin Wang"}],"jpcoar:affiliationName":[{"@value":"Pacific Geoscience Centre Geological Survey of Canada  Sidney British Columbia Canada"},{"@value":"School of Earth and Ocean Sciences University of Victoria  Victoria British Columbia Canada"}]},{"@id":"https://cir.nii.ac.jp/crid/1382262944761217537","@type":"Researcher","foaf:name":[{"@value":"Yanzhao Wang"}],"jpcoar:affiliationName":[{"@value":"State Key Laboratory of Earthquake Dynamics, Institute of Geology China Earthquake Administration  Beijing China"}]},{"@id":"https://cir.nii.ac.jp/crid/1382262944761217665","@type":"Researcher","foaf:name":[{"@value":"Yan Jiang"}],"jpcoar:affiliationName":[{"@value":"Pacific Geoscience Centre Geological Survey of Canada  Sidney British Columbia Canada"}]},{"@id":"https://cir.nii.ac.jp/crid/1382262944761217536","@type":"Researcher","foaf:name":[{"@value":"Stan E. Dosso"}],"jpcoar:affiliationName":[{"@value":"School of Earth and Ocean Sciences University of Victoria  Victoria British Columbia Canada"}]}],"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":"2018-09","prism:volume":"123","prism:number":"9","prism:startingPage":"8056","prism:endingPage":"8072"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JB015620"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB015620"}],"createdAt":"2018-08-07","modifiedAt":"2023-09-10","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360017282190564608","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Imaging evolution of Cascadia slow-slip event using high-rate GPS"}]},{"@id":"https://cir.nii.ac.jp/crid/1360025430178098816","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Slip‐Tremor Interaction at the Very Beginning of Episodic Tremor and Slip in Cascadia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360286994500115200","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Introduction of covariance components in slip inversion of geodetic data following a non-uniform spatial distribution and application to slip deficit rate estimation in the Nankai Trough subduction zone"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567183245672576","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Interplate Slip Following the 2003 Tokachi‐oki Earthquake From Ocean Bottom Pressure Gauge and Land GNSS Data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360572092837601024","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Rupture to the trench? Frictional properties and fracture energy of incoming sediments at the Cascadia subduction zone"}]},{"@id":"https://cir.nii.ac.jp/crid/1360588380610505984","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Viscoelastic earthquake cycle model for the Caribbean subduction zone in northwestern Colombia: Implications of coastal subsidence for seismic/tsunami hazards"}]},{"@id":"https://cir.nii.ac.jp/crid/1360857597179254016","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"New Megathrust Locking Model for the Southern Kurile Subduction Zone Incorporating Viscoelastic Relaxation and Non‐Uniform Compliance of Upper Plate"}]},{"@id":"https://cir.nii.ac.jp/crid/1361975843010031104","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Compliant Volcanic Arc and Backarc Crust in Southern Kurile Suggested by Interseismic Geodetic Deformation"}]},{"@id":"https://cir.nii.ac.jp/crid/1361975843010088704","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Geodetic Evidence of Time‐Dependent Viscoelastic Interseismic Deformation Driven by Megathrust Locking in the Southwest Japan Subduction Zone"}]},{"@id":"https://cir.nii.ac.jp/crid/2051151842049991168","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Structural control and system-level behavior of the seismic cycle at the Nankai Trough"}]},{"@id":"https://cir.nii.ac.jp/crid/2051433317036790784","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Potential of megathrust earthquakes along the southern Ryukyu Trench inferred from GNSS data"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/2018jb015620"},{"@type":"CROSSREF","@value":"10.1038/s41598-022-10957-8_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1029/2024av001425_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1093/gji/ggaa116_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1029/2018jb016328_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1016/j.epsl.2020.116413_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1029/2020jb019981_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1016/j.jsames.2024.104931_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1186/s40623-021-01531-z_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1186/s40623-020-1145-0_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1029/2019gl084656_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"},{"@type":"CROSSREF","@value":"10.1029/2019gl085551_references_DOI_cuaqpRlhruOB4kRD9RrT3cDyKg"}]}