{"@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/1390282681488212992.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.5636/jgg.45.669"}},{"identifier":{"@type":"NAID","@value":"130003559152"}}],"dc:title":[{"@language":"en","@value":"Geomagnetic Secular Variation Reconstructed from Magnetizations of Wide-Diameter Cores of Holocene Sediments in Japan."},{"@value":"Geomagnetic secular variation reconstructed from wide-diameter cores of Holocene sediments in Japan"}],"dc:language":"en","description":[{"type":"abstract","notation":[{"@language":"en","@value":"A record of the secular variation of the geomagnetic field for the last 11000 years has been obtained from the remanent magnetization of seven wide-diameter (20 cm) cores of marine and lacustrine sediment from central to south-west Japan. Magnetization directions of five cores, possessing high-amplitude variations, exhibit good correlation. Two cores show low- amplitude variations, but they can be correlated well with other records after deconvolution to remove filtering effects of the post-depositional magnetization process. A composite secular variation curve was constructed by stacking the field direction records. Time constraints were obtained from radiocarbon ages of shell and wood fractions or tephrochronology. The secular variation curve agrees well with the archeomagnetic record after 1400 yrBP, with a slight difference in the time range 1400-2000 yrBP. The secular variation for the last 11000 years shows an elongated distribution of VGP's. The azimuth of the elongation, about 40°E, is consistent with that of VGP's from Japanese volcanic and sedimentary rocks during Brunhes epoch. The angular standard deviation is 14.5° (upper limit = 15.4°, lower limit = 13.7°). This estimate is slightly larger than that observed globally during Brunhes epoch and the position of the average VGP deviates 8.5° from the geographic north pole. These VGP analyses suggest a stationary nondipole source. The secular variation records from five northern hemisphere sites between 135°E and 95°W in longitude possess a single prominent feature: an extreme easterly swing in declination. A plot of age versus longitude of the swing at each site shows a clear westward drift, at a rate of about 0.13° /yr. The field vector around the swing represents clockwise looping at all the sites. This suggests that the swing is caused by a large non-dipole source which drifts at least from 135°E to 95°W in longitude."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410282681488212993","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253257327"}],"foaf:name":[{"@language":"en","@value":"Hyodo Masayuki"}],"jpcoar:affiliationName":[{"@language":"en","@value":"The Graduate School of Science and Technology, Kobe University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410282681488212994","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253257328"}],"foaf:name":[{"@language":"en","@value":"Itota Chizu"}],"jpcoar:affiliationName":[{"@language":"en","@value":"The Graduate School of Science and Technology, Kobe University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410282681488212992","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253257329"}],"foaf:name":[{"@language":"en","@value":"Yaskawa Katsumi"}],"jpcoar:affiliationName":[{"@language":"en","@value":"The Graduate School of Science and Technology, Kobe University"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00221392"},{"@type":"EISSN","@value":"21855765"}],"prism:publicationName":[{"@language":"en","@value":"Journal of geomagnetism and geoelectricity"},{"@language":"ja","@value":"Ｊｏｕｒｎａｌ　ｏｆ　ｇｅｏｍａｇｎｅｔｉｓｍ　ａｎｄ　ｇｅｏｅｌｅｃｔｒｉｃｉｔｙ"},{"@language":"en","@value":"J. geomagn. geoelec"},{"@language":"ja","@value":"Ｊｏｕｒｎａｌ　ｏｆ　ｇｅｏｍａｇｎｅｔｉｓｍ　ａｎｄ　ｇｅｏｅｌｅｃｔｒｉｃｉｔｙ"}],"dc:publisher":[{"@language":"en","@value":"Society of Geomagnetism and Earth, Planetary and Space Sciences"},{"@language":"ja","@value":"地球電磁気・地球惑星圏学会"}],"prism:publicationDate":"1993","prism:volume":"45","prism:number":"8","prism:startingPage":"669","prism:endingPage":"696"},"reviewed":"false","availableAt":"1993","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050012570391873408","@type":"Article","resourceType":"学術雑誌論文(journal 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transition"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206495105920","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Reversal of Earth’s magnetic field—detailed magneto-climatostratigraphy and geomagnetic influence on climateル"},{"@language":"ja","@value":"地磁気の逆転—高精度磁気・気候層序と地磁気の気候への影響"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206512902912","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Applications of paleomagnetism in the volcanic field"},{"@value":"Applications of paleomagnetism in the volcanic field: A case study of the Unzen Volcano, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681485531008","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Possible Holocene excursion of the Earth's magnetic field in southern South America: New records from archaeological sites in Argentina"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681489963776","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Paleomagnetic directions of the Aso pyroclastic-flow and the Aso-4 co-ignimbrite ash-fall deposits in Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681490437504","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Rock-magnetic changes with reduction diagenesis in Japan Sea sediments and preservation of geomagnetic secular variation in inclination during the last 30, 000 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