{"@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/1360004231143680896.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1007/s00024-016-1345-5"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/content/pdf/10.1007/s00024-016-1345-5.pdf"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/article/10.1007/s00024-016-1345-5/fulltext.html"}},{"identifier":{"@type":"DOI","@value":"10.1007/978-3-319-55480-8_14"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/content/pdf/10.1007/978-3-319-55480-8_14"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Time–Frequency Characteristics of Tsunami Magnetic Signals from Four Pacific Ocean Events"}],"description":[{"notation":[{"@value":"The recent deployment of highly sensitive seafloor magnetometers coinciding with the deep solar minimum has provided excellent opportunities for observing tsunami electromagnetic signals. These fluctuating signals (periods ranging from 10–20 min) are generally found to be within \\(\\pm\\) \\(\\sim\\)1 nT and coincide with the arrival of the tsunami waves. Previous studies focused on tsunami electromagnetic characteristics, as well as modeling the signal for individual events. This study instead aims to provide the time–frequency characteristics for a range of tsunami signals and a method to separate the data’s noise using additional data from a remote observatory. We focus on four Pacific Ocean events of varying tsunami signal amplitude: (1) the 2011 Tohoku, Japan event (M9.0), (2) the 2010 Chile event (M8.8), (3) the 2009 Samoa event (M8.0) and, (4) the 2007 Kuril Islands event (M8.1). We find possible tsunami signals in high-pass filtered data and successfully isolate the signals from noise using a cross-wavelet analysis. The cross-wavelet analysis reveals that the longer period signals precede the stronger, shorter period signals. Our results are very encouraging for using tsunami magnetic signals in warning systems."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004231143681282","@type":"Researcher","foaf:name":[{"@value":"N. R. Schnepf"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004231143681033","@type":"Researcher","foaf:name":[{"@value":"C. Manoj"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004231143681156","@type":"Researcher","foaf:name":[{"@value":"C. An"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004231143681024","@type":"Researcher","foaf:name":[{"@value":"H. Sugioka"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004231143681031","@type":"Researcher","foaf:name":[{"@value":"H. Toh"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00334553"},{"@type":"EISSN","@value":"14209136"},{"@type":"PISSN","@value":"25043625"},{"@type":"EISSN","@value":"25043633"},{"@type":"ISBN","@value":"9783319554792"},{"@type":"ISBN","@value":"9783319554808"}],"prism:publicationName":[{"@value":"Pure and Applied Geophysics"}],"dc:publisher":[{"@value":"Springer Science and Business Media LLC"}],"prism:publicationDate":"2016-07-15","prism:volume":"173","prism:number":"12","prism:startingPage":"3935","prism:endingPage":"3953"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://www.springer.com/tdm","http://www.springer.com/tdm"],"url":[{"@id":"http://link.springer.com/content/pdf/10.1007/s00024-016-1345-5.pdf"},{"@id":"http://link.springer.com/article/10.1007/s00024-016-1345-5/fulltext.html"},{"@id":"https://link.springer.com/content/pdf/10.1007/978-3-319-55480-8_14"}],"createdAt":"2016-07-15","modifiedAt":"2022-07-03","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782284094720","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"26282101"},{"@type":"JGN","@value":"JP26282101"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26282101/"}],"notation":[{"@language":"ja","@value":"海底電磁場データのリアルタイム転送による津波の早期警戒"},{"@language":"en","@value":"Tsunami early warning by realtime transfer of seafloor electromagnetic data"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282810831490432","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Properties of electromagnetic fields generated by tsunami first arrivals: Classification based on the ocean depth"}]},{"@id":"https://cir.nii.ac.jp/crid/1050583402767207168","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"TIARES Project -Tomographic investigation by seafloor array experiment for the Society hotspot"},{"@value":"TIARES Project—Tomographic investigation by seafloor array experiment for the Society hotspot"}]},{"@id":"https://cir.nii.ac.jp/crid/1050585658871086464","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Simultaneous 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