{"@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/1360294643752230144.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2021jb021841"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2021JB021841"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JB021841"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2021JB021841"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Comparison of Bubble Shape Model Results With Textural Analysis: Implications for the Velocity Profile Across a Volcanic Conduit"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Tube pumice, which is characterized by aligned elongated bubbles, is valuable for our understanding of the shear field in a volcanic conduit. Most previous studies interpreted that tube pumice forms through simple shear, assuming a parabolic velocity profile across a volcanic conduit. However, simple shear cannot account for the observation that tube pumice is rare in plinian fall deposits but frequent in ignimbrites at the Taupō volcano, if the pyroclastic flows that formed them erupted through a wider vent and had a lower average shear rate. Here, we analyze the dynamics of bubble deformation that occurred during the 232 CE Taupō eruption by combining a bubble deformation model with a conduit flow model. The results indicate that bubble deformation is largely controlled by the velocity profile across a conduit. If the conduit flow has a parabolic velocity profile, the amount of bubble elongation is unrealistic compared to the Taupō fall deposits. It is more likely that the conduit flow has a plug‐like velocity profile due to viscous heating. We numerically confirmed that bubbles in the plug‐like flow are subject mainly to pure shear and accumulate less strain for elongation. We also calculated a viscous heating flow of the ignimbrite phase. We modeled a wider conduit, which suppresses viscous heating around the conduit walls and causes a higher proportion of the conduit to experience parabolic flow, compared to the plinian phase. The increased proportion of a parabolic profile may explain the high frequency of elongated bubbles in the ignimbrite phase pumice.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380294643752230146","@type":"Researcher","foaf:name":[{"@value":"Masatoshi Ohashi"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute University of Tokyo  Tokyo Japan"},{"@value":"Department of Earth and Planetary Sciences Kyushu University  Fukuoka Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1420845751157332736","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"00376625"},{"@type":"NRID","@value":"1000000376625"},{"@type":"NRID","@value":"9000004602256"},{"@type":"NRID","@value":"9000402391320"},{"@type":"NRID","@value":"9000415352425"},{"@type":"NRID","@value":"9000408782537"},{"@type":"NRID","@value":"9000410949917"},{"@type":"NRID","@value":"9000400161047"},{"@type":"NRID","@value":"9000400158277"},{"@type":"NRID","@value":"9000415352905"},{"@type":"NRID","@value":"9000263067799"},{"@type":"NRID","@value":"9000348791922"},{"@type":"NRID","@value":"9000398819756"},{"@type":"NRID","@value":"9000400159936"},{"@type":"NRID","@value":"9000263067818"},{"@type":"NRID","@value":"9000399166935"},{"@type":"NRID","@value":"9000411392714"},{"@type":"NRID","@value":"9000402391360"},{"@type":"NRID","@value":"9000014233796"},{"@type":"NRID","@value":"9000394967896"},{"@type":"NRID","@value":"9000400157415"},{"@type":"NRID","@value":"9000263067877"},{"@type":"NRID","@value":"9000411392779"},{"@type":"NRID","@value":"9000400159461"},{"@type":"NRID","@value":"9000254741903"},{"@type":"NRID","@value":"9000411260146"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/MIchihara"}],"foaf:name":[{"@value":"Mie Ichihara"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute University of Tokyo  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380294643752230278","@type":"Researcher","foaf:name":[{"@value":"Ben Kennedy"}],"jpcoar:affiliationName":[{"@value":"Department of Geological Sciences University of Canterbury  Christchurch New Zealand"}]},{"@id":"https://cir.nii.ac.jp/crid/1380294643752230277","@type":"Researcher","foaf:name":[{"@value":"Darren Gravley"}],"jpcoar:affiliationName":[{"@value":"Department of Geological Sciences University of Canterbury  Christchurch New Zealand"}]}],"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":"2021-06","prism:volume":"126","prism:number":"6"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1029/2021JB021841"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JB021841"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2021JB021841"}],"createdAt":"2021-06-07","modifiedAt":"2023-08-25","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282256990207488","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19H00713"},{"@type":"JGN","@value":"JP19H00713"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H00713/"}],"notation":[{"@language":"ja","@value":"流体の破壊力学―破壊の時間発展モデル構築と流動履歴依存性の検討"},{"@language":"en","@value":"Fracture mechanics of fluids; Modeling the fracture process and its dependence on deformation history"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004233291053056","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The Condition of Eruption Column Collapse: 1. 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