{"@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/1360021390563027840.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1186/s40623-023-01831-6"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/content/pdf/10.1186/s40623-023-01831-6.pdf"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/article/10.1186/s40623-023-01831-6/fulltext.html"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Estimation of phase velocity using array observation of microtremors with arbitrary shape"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:sec>\n                <jats:title>Abstract</jats:title>\n                <jats:p>To estimate the phase velocity using the array observations of microtremors, some algorithms for the estimation include constraints on the array shape, such as equilateral triangles or the placement of receivers on a circle, in order to reduce the estimation error of the phase velocity. In the present study, a direct estimation technique is introduced for the phase velocity using records obtained through an array with an arbitrary shape based on a complex coherency function (CCF), where CCF is defined as the normalized cross spectrum of the microtremor records observed simultaneously by two receivers. The particle swarm optimization (PSO) method, one of metaheuristic optimization methods, is applied and optimal values are provided for the phase velocity and other unknown parameters. Approximate representations of the stochastic properties for the unknown variables are analytically derived based on the discrete representation of the CCF, for a case where the arrival directions of microtremors are treated as random variables following a uniform distribution. Furthermore, the validity of the proposed method is confirmed using numerical simulations and actual observation records.</jats:p>\n              </jats:sec><jats:sec>\n                <jats:title>Graphical Abstract</jats:title>\n                \n              </jats:sec>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021390563027715","@type":"Researcher","foaf:name":[{"@value":"Harusato Kimura"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326222515840","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"60273463"},{"@type":"NRID","@value":"1000060273463"},{"@type":"CINII_AUTHOR_ID","@value":"DA1311785X"},{"@type":"URI","@value":"https://ci.nii.ac.jp/author/DA1311785X#entity"},{"@type":"URI","@value":"https://viaf.org/viaf/NII%7CDA1311785X"},{"@type":"NRID","@value":"9000403818498"},{"@type":"NRID","@value":"9000396091614"},{"@type":"NRID","@value":"9000256453239"},{"@type":"NRID","@value":"9000256456896"},{"@type":"NRID","@value":"9000254828903"},{"@type":"NRID","@value":"9000391405130"},{"@type":"NRID","@value":"9000403818604"},{"@type":"NRID","@value":"9000410170185"},{"@type":"NRID","@value":"9000412134485"},{"@type":"NRID","@value":"9000258501032"},{"@type":"NRID","@value":"9000262360341"},{"@type":"NRID","@value":"9000254830223"},{"@type":"NRID","@value":"9000258514709"},{"@type":"NRID","@value":"9000256362562"},{"@type":"NRID","@value":"9000023739168"},{"@type":"NRID","@value":"9000403818518"},{"@type":"NRID","@value":"9000403818154"},{"@type":"NRID","@value":"9000254830607"},{"@type":"NRID","@value":"9000398128296"},{"@type":"NRID","@value":"9000345378374"},{"@type":"NRID","@value":"9000256456922"},{"@type":"NRID","@value":"9000256453729"},{"@type":"NRID","@value":"9000259833218"},{"@type":"NRID","@value":"9000345378793"},{"@type":"NRID","@value":"9000363172696"},{"@type":"NRID","@value":"9000254331812"},{"@type":"NRID","@value":"9000258442581"},{"@type":"NRID","@value":"9000015174390"},{"@type":"NRID","@value":"9000403838137"},{"@type":"NRID","@value":"9000415088804"},{"@type":"NRID","@value":"9000258263532"},{"@type":"NRID","@value":"9000256453202"},{"@type":"NRID","@value":"9000256456735"},{"@type":"NRID","@value":"9000256841601"},{"@type":"NRID","@value":"9000345378806"},{"@type":"NRID","@value":"9000283418264"},{"@type":"NRID","@value":"9000256841646"},{"@type":"NRID","@value":"9000256456769"},{"@type":"NRID","@value":"9000256456892"},{"@type":"NRID","@value":"9000010521584"},{"@type":"NRID","@value":"9000256456899"},{"@type":"NRID","@value":"9000014598502"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/h_morika"}],"foaf:name":[{"@value":"Hitoshi Morikawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390563027717","@type":"Researcher","foaf:name":[{"@value":"Haruka Tomobe"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390563027841","@type":"Researcher","foaf:name":[{"@value":"Kahori Iiyama"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"18805981"}],"prism:publicationName":[{"@value":"Earth, Planets and Space"}],"dc:publisher":[{"@value":"Springer Science and Business Media LLC"}],"prism:publicationDate":"2023-05-18","prism:volume":"75","prism:number":"1"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["https://creativecommons.org/licenses/by/4.0","https://creativecommons.org/licenses/by/4.0"],"url":[{"@id":"https://link.springer.com/content/pdf/10.1186/s40623-023-01831-6.pdf"},{"@id":"https://link.springer.com/article/10.1186/s40623-023-01831-6/fulltext.html"}],"createdAt":"2023-05-18","modifiedAt":"2023-05-18","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=G","dc:title":"G"},{"@id":"https://cir.nii.ac.jp/all?q=Microtremor%20survey","dc:title":"Microtremor survey"},{"@id":"https://cir.nii.ac.jp/all?q=QB275-343","dc:title":"QB275-343"},{"@id":"https://cir.nii.ac.jp/all?q=QE1-996.5","dc:title":"QE1-996.5"},{"@id":"https://cir.nii.ac.jp/all?q=Complex%20coherency%20function%20(CCF)","dc:title":"Complex coherency function (CCF)"},{"@id":"https://cir.nii.ac.jp/all?q=Geography.%20Anthropology.%20Recreation","dc:title":"Geography. 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ドウテイホウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681487555584","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Inversion of phase velocity of long-period microtremors to the S-wave-velocity structure down to the basement in urbanized areas."},{"@value":"Inversion of the phase velocity of long-period microtremors to the S-wave-velocity structure down to the basement in urbanized areas"}]},{"@id":"https://cir.nii.ac.jp/crid/1881147691223733888","@type":"Dataset","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Spatially averaged coherencies (krSPAC) and Rayleigh effective-mode modeling of microtremor data from asymmetric arrays"}]},{"@id":"https://cir.nii.ac.jp/crid/2051996266992054400","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Array-size dependency of the upper limit wavelength normalized by array radius for the standard spatial 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