{"@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/1361418518889286016.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1007/s00445-020-1358-x"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/content/pdf/10.1007/s00445-020-1358-x.pdf"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/article/10.1007/s00445-020-1358-x/fulltext.html"}}],"dc:title":[{"@value":"Heat source of the 2014 phreatic eruption of Mount Ontake, Japan"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>We present petrological evidence of the shallow magmatic processes that may have supplied heat and gas to the eruption of Mount Ontake, Japan, on 27 September 2014, which resulted in 63 fatalities. Ash from the eruption comprises primarily hydrothermally altered, white-toned rock fragments. However, the ash contains trace amounts (< 0.7 wt%) of vitreous less-altered particles (LAPs), which are only altered on their surfaces, suggesting rapid ascent through the hydrothermal system. The LAPs are classified into two categories: “glassy” and “crystalline.” Glassy LAPs comprise high-silica rhyolitic glass (74–83 wt% SiO<jats:sub>2</jats:sub>) with rounded quartz, chalcedony-free vesicles, and reversely zoned plagioclase (cores = 47 mol% An; rims = 70 mol% An), indicating magma re-heating. Crystalline LAPs have a groundmass-like texture that suggests eutectic crystallization at shallow depths. Thermodynamic calculations indicate that the pre-eruptive temperatures of the glassy and crystalline LAPs were 700–1300 °C and ~ 700 °C, respectively, and that the storage depth was < 4 km (pressure < 100 MPa). The observed petrological features suggest that the LAPs were sourced from a magma recently intruded at shallow depths. Although crustal deformation (i.e., the volume change associated with magmatic intrusion) was insignificant prior to the 2014 eruption, a clear signature of crustal deformation was observed in 2007, the source of which was located 3 km below the summit. We suggest that the magma that was intruded 3 km below the summit in 2007 supplied the heat and gas for the 2014 phreatic eruption.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381418518889286020","@type":"Researcher","foaf:name":[{"@value":"Isoji Miyagi"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418518889286019","@type":"Researcher","foaf:name":[{"@value":"Nobuo Geshi"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418518889286018","@type":"Researcher","foaf:name":[{"@value":"Satoshi Hamasaki"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418518889286016","@type":"Researcher","foaf:name":[{"@value":"Teruki Oikawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1381418518889286017","@type":"Researcher","foaf:name":[{"@value":"Akihiko Tomiya"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"02588900"},{"@type":"EISSN","@value":"14320819"}],"prism:publicationName":[{"@value":"Bulletin of Volcanology"}],"dc:publisher":[{"@value":"Springer Science and Business Media LLC"}],"prism:publicationDate":"2020-03-04","prism:volume":"82","prism:number":"4","prism:startingPage":"83"},"reviewed":"false","dc:rights":["https://creativecommons.org/licenses/by/4.0","https://creativecommons.org/licenses/by/4.0"],"url":[{"@id":"http://link.springer.com/content/pdf/10.1007/s00445-020-1358-x.pdf"},{"@id":"http://link.springer.com/article/10.1007/s00445-020-1358-x/fulltext.html"}],"createdAt":"2020-03-04","modifiedAt":"2021-03-04","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232523377024","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Effects of pore fluid pressure and tectonic stress on diverse seismic activities around the Mt. 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