{"@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/1360004233291634048.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018gl078851"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018GL078851"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/am-pdf/10.1029%2F2018GL078851"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078851"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Azimuth Estimations From a Small Aperture Infrasonic Array: Test Observations at Stromboli Volcano, Italy"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>We tested the performance of an infrasonic array consisting of three microphones with a 20‐m aperture at Stromboli volcano, Italy. There were four active vents separated by ∼10<jats:sup>∘</jats:sup>. We employed multiple signal classification (MUSIC) to estimate direction of arrival (DOA) of the detected signals. Using test signals of which the source vents were identified by visual observation, the resolution of DOA estimation of MUSIC is compared with those of Capon beamforming, grid search, and semblance. We confirmed that MUSIC and grid search gave better resolution of DOA than the other two methods. Also, MUSIC provided the best resolutions in time and frequency. It was shown that the DOA switched between different vents or fluctuated in short time scales and can vary with frequency, which indicate multiple active sources. Possible DOA estimation errors were evaluated. A small aperture infrasonic array combined with MUSIC will become a powerful tool for studying and monitoring active volcanoes.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004233291634052","@type":"Researcher","foaf:name":[{"@value":"Kazuya Yamakawa"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute University of Tokyo  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233291634063","@type":"Researcher","foaf:name":[{"@value":"Mie Ichihara"}],"jpcoar:affiliationName":[{"@value":"Earthquake Research Institute University of Tokyo  Tokyo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233291634065","@type":"Researcher","foaf:name":[{"@value":"Kyoka Ishii"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics, Graduate School of Science Kyoto University  Kyoto Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233291633928","@type":"Researcher","foaf:name":[{"@value":"Hiroshi Aoyama"}],"jpcoar:affiliationName":[{"@value":"Institute of Seismology and Volcanology, Faculty of Science Hokkaido University  Sapporo Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233291634066","@type":"Researcher","foaf:name":[{"@value":"Takeshi Nishimura"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics, Graduate School of Science Tohoku University  Sendai Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233291634055","@type":"Researcher","foaf:name":[{"@value":"Maurizio Ripepe"}],"jpcoar:affiliationName":[{"@value":"Dipartimento di Scienze della Terra Università di Firenze  Florence Italy"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00948276"},{"@type":"EISSN","@value":"19448007"}],"prism:publicationName":[{"@value":"Geophysical Research Letters"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2018-09-06","prism:volume":"45","prism:number":"17","prism:startingPage":"8931","prism:endingPage":"8938"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018GL078851"},{"@id":"https://onlinelibrary.wiley.com/doi/am-pdf/10.1029%2F2018GL078851"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018GL078851"}],"createdAt":"2018-08-22","modifiedAt":"2023-09-09","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=NEANIAS%20Atmospheric%20Research%20Community","dc:title":"NEANIAS Atmospheric Research Community"},{"@id":"https://cir.nii.ac.jp/all?q=Geophysics","dc:title":"Geophysics"},{"@id":"https://cir.nii.ac.jp/all?q=General%20Earth%20and%20Planetary%20Sciences","dc:title":"General Earth and Planetary Sciences"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781824469120","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15H01794"},{"@type":"JGN","@value":"JP15H01794"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15H01794/"}],"notation":[{"@language":"ja","@value":"離島火山活動のリモートモニタリングの実現"},{"@language":"en","@value":"Remote monitoring of island volcanic activities using an autonomous vehicle"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256952424448","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17K20141"},{"@type":"JGN","@value":"JP17K20141"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K20141/"}],"notation":[{"@language":"ja","@value":"2018年草津白根火山噴火に関する総合調査"},{"@language":"en","@value":"Comprehensive Survey of 2018 Kusatsu-Shirane Eruption"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360011144897409280","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Infrasound associated with 2004–2005 large Sumatra earthquakes and tsunami"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145773526272","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Chapter 9 Thermal, acoustic and seismic signals from pyroclastic density currents and Vulcanian explosions at Soufrière Hills Volcano, Montserrat"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292618802016000","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Deterministic frequency‐wavenumber methods and direct measurements of rupture propagation during earthquakes using a dense array: Theory and methods"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567179759371648","@type":"Article","resourceType":"学術雑誌論文(journal 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