{"@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/1360580229797981056.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1093/gji/ggac225"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac225/44249030/ggac225.pdf"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/gji/article-pdf/231/2/1196/45186580/ggac225.pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Multimode dispersion measurement of surface waves extracted by multicomponent ambient noise cross-correlation functions"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>SUMMARY</jats:title>\n               <jats:p>Cross-correlation functions of ambient seismic noise sometimes show multimode characteristics of surface waves, especially in observations in sedimentary areas and ocean areas. Multimode dispersion curves are useful for improving the depth resolution of subsurface imaging; nevertheless, measuring the multimode dispersion curves is not easy. Multimode interference of surface waves makes the cross-correlation functions complicated even without lateral heterogeneity of the subsurface structure, and the complex waveforms may result in unphysical dispersion measurement. We developed a method to determine multimode phase velocity dispersion curves based on the fitting of the synthetic cross-spectra to observed ones. The phase velocity in the synthetic cross-spectra is modelled as the function of a 1-D velocity structure, which achieves the measurement of physically realizable dispersion curves. The 1-D structures do not necessarily represent the Earth structure directly but act as model parameters of the dispersion curves within station pairs. The cross-spectral fitting has two steps, that is, array-based and single-pair fittings. The first step estimates the amplitude of each surface wave mode and the reference 1-D structure from the cross-spectral data within an array. The second step estimates the pair-dependent dispersion curves from the cross-spectra of a single station pair using the modal amplitudes and the reference structure estimated by the first step. The dispersion measurement based on the cross-spectral fitting can work even at short distances where the multimode inference is significant in the time-domain cross-correlation functions. We applied this method to synthetic and field data in seafloor observations. The synthetic and field applications show that the simultaneous use of multicomponent cross-correlation functions is effective to determine multimode dispersion curves. The multimode phase velocity dispersion curves in the ocean area are estimated stably even though the signal-to-noise ratio of cross-correlation functions is not high. The pair-dependent multimode dispersion curves estimated by the present method can serve as robust input data for high-resolution surface wave tomography.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420001326206522624","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"10735963"},{"@type":"NRID","@value":"1000010735963"},{"@type":"NRID","@value":"9000410904522"},{"@type":"NRID","@value":"9000024127561"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/7000014712"}],"foaf:name":[{"@value":"Ryota Takagi"}],"jpcoar:affiliationName":[{"@value":"Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University , 6-6 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Miyagi , Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1420564276159429376","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"10345176"},{"@type":"NRID","@value":"1000010345176"},{"@type":"NRID","@value":"9000003132839"},{"@type":"NRID","@value":"9000270140883"},{"@type":"NRID","@value":"9000415352906"},{"@type":"NRID","@value":"9000411657442"},{"@type":"NRID","@value":"9000362208769"},{"@type":"NRID","@value":"9000411392780"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/qnishida"}],"foaf:name":[{"@value":"Kiwamu Nishida"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute, The University of Tokyo , 1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032 , Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0956540X"},{"@type":"EISSN","@value":"1365246X"}],"prism:publicationName":[{"@value":"Geophysical Journal International"}],"dc:publisher":[{"@value":"Oxford University Press (OUP)"}],"prism:publicationDate":"2022-06-24","prism:volume":"231","prism:number":"2","prism:startingPage":"1196","prism:endingPage":"1220"},"reviewed":"false","dc:rights":["https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model"],"url":[{"@id":"https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac225/44249030/ggac225.pdf"},{"@id":"https://academic.oup.com/gji/article-pdf/231/2/1196/45186580/ggac225.pdf"}],"createdAt":"2022-06-24","modifiedAt":"2022-07-29","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282256998855296","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19K14809"},{"@type":"JGN","@value":"JP19K14809"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19K14809/"}],"notation":[{"@language":"ja","@value":"地殻変動・地震データの系統的解析に基づく非地震性すべりの地域性とその原因解明"},{"@language":"en","@value":"Study on spatial variations of aseismic slips inferred from systematic analyses of geodetic and seismic data"}]},{"@id":"https://cir.nii.ac.jp/crid/1040287907244177792","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21K03715"},{"@type":"JGN","@value":"JP21K03715"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21K03715/"}],"notation":[{"@language":"ja","@value":"脈動実体波を用いた地球深部構造推定"},{"@language":"en","@value":"Deep Earth Exploration Using Body-Wave Microseisms"}]},{"@id":"https://cir.nii.ac.jp/crid/1040848250652977152","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20K04122"},{"@type":"JGN","@value":"JP20K04122"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20K04122/"}],"notation":[{"@language":"ja","@value":"広帯域海底地震計観測に基づく北海道襟裳沖スロー地震とプレート境界構造の時空間変動"},{"@language":"en","@value":"Space time study in slow earthquake activity and surrounding seismic structure southern  off Hokkaido using broad-band ocean bottom 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