{"@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/1360574095598690816.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2008jb005869"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2008JB005869"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2008JB005869"}},{"identifier":{"@type":"NAID","@value":"10029017309"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Sudden drop of seismic velocity after the 2004 <i>M</i><sub><i>w</i></sub> 6.6 mid‐Niigata earthquake, Japan, observed with Passive Image Interferometry"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Passive Image Interferometry (PII) is a seismological method employing ambient seismic noise to monitor the temporal evolution of mean shear wave velocity within the Earth. First, the elastic Green's tensor between two seismometers is computed from the cross correlation of seismic noise recorded during a certain period. Second, the constructed seismograms of different time periods are treated as earthquake multiplets, and small time shifts in their coda are used to invert a relative change in mean shear wave velocity. When applied to the source region of the 2004 <jats:italic>M</jats:italic><jats:sub><jats:italic>w</jats:italic></jats:sub> = 6.6 mid‐Niigata earthquake, Japan (centroid depth 5 km), we used noise recorded at six seismometers located at a distance of less than 25 km from the epicenter. Daily inversions during the 2 months before and after the earthquake show a sudden drop of mean shear wave velocity of some tenths of a percent at the time of the mid‐Niigata earthquake. Using noise in two frequency bands, 0.1–0.5 Hz and 2–8 Hz, we find similar amplitudes for the velocity drop, which indicates that changes are not restricted to the shallow subsurface. Possible interpretations of this velocity decrease are a decrease of crustal stress after the earthquake, a nonlinear site response in the shallow subsurface layer due to strong ground motion, or structural weakening due to the creation of new fractures in the source area of the earthquake.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1582261549906384768","@type":"Researcher","foaf:name":[{"@value":"U. Wegler"}],"jpcoar:affiliationName":[{"@value":"Federal Institute for Geosciences and Natural Resources  Hanover Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1380574095598690819","@type":"Researcher","foaf:name":[{"@value":"H. Nakahara"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics, Graduate School of Science Tohoku University  Sendai Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380861292999664000","@type":"Researcher","foaf:name":[{"@value":"C. Sens‐Schönfelder"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics and Geology University of Leipzig  Leipzig Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1380574095598690816","@type":"Researcher","foaf:name":[{"@value":"M. Korn"}],"jpcoar:affiliationName":[{"@value":"Department of Geophysics and Geology University of Leipzig  Leipzig Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1380574095598690820","@type":"Researcher","foaf:name":[{"@value":"K. Shiomi"}],"jpcoar:affiliationName":[{"@value":"National Research Institute for Earth Science and Disaster Prevention  Tsukuba Japan"}]}],"contributor":[{"@id":"https://cir.nii.ac.jp/crid/1893679867969245061","@type":"Researcher","foaf:name":[{"@value":"0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2009-06","prism:volume":"114","prism:number":"B6","prism:startingPage":"B06305"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2008JB005869"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2008JB005869"}],"createdAt":"2009-06-12","modifiedAt":"2023-10-12","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=550%20-%20Earth%20sciences","dc:title":"550 - Earth sciences"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782056658176","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"20740248"},{"@type":"JGN","@value":"JP20740248"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20740248/"}],"notation":[{"@language":"ja","@value":"地震波干渉法の理論的背景に関する研究と浅層地盤探査への応用"},{"@language":"en","@value":"Theoretical study on seismic interferometry and its application to shallow subsurface exploration"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002216708238976","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Temporal change of phase velocity beneath Mt. 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