{"@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/1360011143544324480.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/s0012-821x(02)00857-9"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X02008579?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X02008579?httpAccept=text/plain"}}],"dc:title":[{"@value":"Magnetic and electric field observations during the 2000 activity of Miyake-jima volcano, Central Japan"}],"description":[{"notation":[{"@value":"Magnetic and electric field variations associated with the 2000 eruption of Miyake-jima volcano are summarized. For about 1 week prior to the July 8 phreatic explosion, significant changes in the total intensity were observed at a few stations, which indicated uprising of a demagnetized area from a depth of 2 km towards the summit: this nonmagnetic source can be regarded as a vacant space itself. Electric and magnetic field variations were observed simultaneously associated with the tilt-step event, which was the abrupt (V50 s) inflation at a few km depth within the volcano followed by gradual recovery (Vseveral hours). The electric field is ascribed to the electrokinetic effect most probably due to forced injection of fluids from the source, while the magnetic field to the piezomagnetic effect due to increased pressure. Large magnetic variations amounting to a few tens of nT were observed at several stations since July 8, and they turned almost flat after the August 18 largest eruption. Magnetic changes are explained mostly by the vanishing of magnetic mass in the summit and additionally by the thermal demagnetization at a rather shallow depth. A large increase in the self-potential by 130 mV was also observed near the summit caldera associated with the August 18 eruption, which suggests that the hydrothermal circulation system sustained within the volcano for the past more than 10 years was destroyed by this eruption. 9 2002 Published by Elsevier Science B.V."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380011143544324483","@type":"Researcher","foaf:name":[{"@value":"Yoichi Sasai"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143544324480","@type":"Researcher","foaf:name":[{"@value":"Makoto Uyeshima"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143544324482","@type":"Researcher","foaf:name":[{"@value":"Jacques Zlotnicki"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143544324481","@type":"Researcher","foaf:name":[{"@value":"Hisashi Utada"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143544324484","@type":"Researcher","foaf:name":[{"@value":"Tsuneomi Kagiyama"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143544324485","@type":"Researcher","foaf:name":[{"@value":"Takeshi Hashimoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1380011143544324608","@type":"Researcher","foaf:name":[{"@value":"Yuji Takahashi"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0012821X"}],"prism:publicationName":[{"@value":"Earth and Planetary Science Letters"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2002-10","prism:volume":"203","prism:number":"2","prism:startingPage":"769","prism:endingPage":"777"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0012821X02008579?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0012821X02008579?httpAccept=text/plain"}],"createdAt":"2002-10-21","modifiedAt":"2020-03-09","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050290769977980416","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Piezomagnetic fields associated with a dislocation source in a layered elastic medium"}]},{"@id":"https://cir.nii.ac.jp/crid/1360013168773594880","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self‐potential, and Thermal Image: An Example of Miyakejima (Japan)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285710546165376","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Numerical simulation of piezomagnetic changes associated with hydrothermal pressurization"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206458913024","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Hydrothermal Activity Inferred from Comprehensive Observation of Unrest in Adatara Volcano"},{"@value":"安達太良山の火山活動の総合的観測と推定される熱水活動"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206512023040","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Slow slip in the focal region of the anticipated Tokai earthquake following the seismo-volcanic event in the northern Izu Islands in 2000"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679123276416","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Magnetic and electric field monitoring of Taal volcano, Philippines Part I: Magnetic measurements"},{"@value":"Magnetic and electric field monitoring of Taal volcano, Philippines(Part 1)Magnetic measurements"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679205563008","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Geomagnetic and Topographic Survey of the Main Crater Lake in Taal Volcano (Philippines): Preliminary Report"},{"@language":"ja","@value":"フィリピン・タール火山・主火口湖の磁気および水深測量：序報"},{"@language":"ja-Kana","@value":"フィリピン タール カザン シュカコウコ ノ ジキ オヨビ スイシン ソクリョウ ジョホウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681489937664","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Three-dimensional inversion for 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