{"@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/1361137045983676928.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/93jb02391"}},{"identifier":{"@type":"URI","@value":"http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F93JB02391"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F93JB02391"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/93JB02391"}}],"dc:title":[{"@value":"Tectonic sediment thickening, fluid expulsion, and the thermal regime of subduction zone accretionary prisms: The Cascadia Margin off Vancouver Island"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Tectonic sediment thickening, fluid expulsion, and the resulting thermal regime of the northern Cascadia subduction zone accretionary prism have been described by numerical models. Both the sediment thickening and the fluid expulsion are found to have important thermal effects. Constraints on the models are provided by (1) detailed heat flow profiles across the continental slope accretion zone from variations in the thermally controlled depth to a gas hydrate bottom‐simulating reflector (BSR), and (2) porosity changes across the accretion zone inferred from the landward variation in the <jats:italic>P</jats:italic> wave velocity‐depth profiles. The heat flow in the region of rapid prism thickening centered 15 km landward of the deformation front is 20% below that predicted by a larger scale thermal model that ignores the thermal effects of the sediment accretion processes. The porosity also is substantially higher in this region compared to at the same depths in the adjacent deep sea Cascadia basin. The model results are in agreement with both the thermal and velocity data if the incoming sediment section is initially simply tectonically shortened horizontally and thickened vertically, generating a high porosity underconsolidated section. Reconsolidation and fluid expulsion in response to the tectonic thickening is slow, occurring mainly 20–30 km landward of the deformation front. The maximum predicted fluid expulsion rate is about 4 × 10<jats:sup>−11</jats:sup> m s<jats:sup>−1</jats:sup> (1.3 mm a<jats:sup>−1</jats:sup>). The pore pressure distribution across the deformation front region has been estimated from the velocity data using the simplifying assumption that velocity is only a function of effective pressure; pore pressures are high, reaching 80% of lithostatic 15 to 20 km landward of the deformation front. An estimate of the bulk permeability in the seaward tens of kilometers of the prism ranging from 10<jats:sup>−16</jats:sup> m<jats:sup>2</jats:sup> near the top to about 10<jats:sup>−18</jats:sup> m<jats:sup>2</jats:sup> near the base has been obtained through matching the pore pressure distribution in the numerical model to that obtained from the velocity data. The prism sediments are inferred to be substantially underconsolidated and pore pressures to be high for at least the seaward 30 km of the accretionary prism.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381137045983676931","@type":"Researcher","foaf:name":[{"@value":"R. D. Hyndman"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137045983676929","@type":"Researcher","foaf:name":[{"@value":"K. Wang"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137045983676928","@type":"Researcher","foaf:name":[{"@value":"T. Yuan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137045983676930","@type":"Researcher","foaf:name":[{"@value":"G. D. Spence"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1993-12-10","prism:volume":"98","prism:number":"B12","prism:startingPage":"21865","prism:endingPage":"21876"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F93JB02391"},{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F93JB02391"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/93JB02391"}],"createdAt":"2008-02-06","modifiedAt":"2023-09-23","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282810757340928","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Granular experiments of thrust wedges: Insights relevant to methane hydrate exploration at the Nankai accretionary prism"}]},{"@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/1360004232324926976","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Hanging wall deformation of a seismogenic megasplay fault in an accretionary prism: The Nobeoka Thrust in southwestern Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004233284650368","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Horizontal shortening versus vertical loading in accretionary prisms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285707500193280","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The vertical chloride ion profile at the IODP Site C0002, Kumano Basin, off coast of Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567185481585792","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Three‐dimensional texture of natural pseudotachylyte: Pseudotachylyte formation mechanism in hydrous accretionary complex"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855567863748736","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Distributions of gas hydrate and free gas accumulations associated with upward fluid flow in the Sanriku-Oki forearc basin, northeast Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206238723712","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Seismogenic fault-rock and fluid flow in ancient subduction zone:Field guide of Okitsu, Kure and Yokonami Melanges, Cretaceous Shimanto accretionary complex, Shikoku, Japan"},{"@language":"ja","@value":"沈み込みプレート境界地震発生帯破壊変形と流体移動：高知県西部白亜系四万十帯，興津，久礼，横浪メランジュ"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/93jb02391"},{"@type":"CROSSREF","@value":"10.1002/2013gc004818_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.1029/2008gc002279_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.1016/j.jsg.2013.03.015_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.1016/j.marpetgeo.2013.11.008_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.1016/j.marpetgeo.2020.104305_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.1016/j.tecto.2016.11.029_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.1111/iar.12241_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"},{"@type":"CROSSREF","@value":"10.5575/geosoc.112.s71_references_DOI_4R8x2WXWt0TExHR9GT67hTGW9Sp"}]}