{"@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/1360002219861553792.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1785/0120120321"}},{"identifier":{"@type":"URI","@value":"https://syndication.highwire.org/content/doi/10.1785/0120120321"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"The Effect of Lateral Heterogeneity on Horizontal-to-Vertical Spectral Ratio of Microtremors Inferred from Observation and Synthetics"}],"description":[{"notation":[{"@value":"Horizontal‐to‐vertical (H/V) spectral ratios of microtremors (HVRM) have been traditionally interpreted as representing either the S‐wave amplification directly or the Rayleigh‐wave ellipticity for a horizontally layered structure. However, based on the diffuse field theory, we have derived an alternative theoretical basis that HVRM corresponds to the square root of the ratio between the imaginary part of the horizontal Green's function and that of the vertical one. Under that condition, the 1D horizontal layering assumption is not needed to interpret HVRM. As observational evidence of such non‐1D HVRM, we discovered significant directional dependency at a site on the Uji campus, Kyoto University, Japan. The observed microtremor north-south/vertical spectral ratios are quite stable and have only one peak around 0.5 Hz. On the other hand, the east-west/vertical spectral ratios are smaller in amplitude and have higher peak frequencies and sometimes two separated peaks. The directional dependency of observed HVRM is aligned to the axis of the 2D basin structure. We performed numerical analyses by spectral element method using a unit load on the surface to examine the effect of the 2D basin structure on the imaginary parts of the Green's functions. We found that the 2D basin structure clearly changes the characteristics of the H/V spectral ratios in both perpendicular and parallel directions relative to the basin axis. Thus, we succeeded in theoretically simulating the qualitative difference between the H/V spectral ratios for two orthogonal horizontal components of the HVRM observed on the Uji campus."}]},{"notation":[{"@value":"International audience"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380284923221817858","@type":"Researcher","foaf:name":[{"@value":"S. Matsushima"}]},{"@id":"https://cir.nii.ac.jp/crid/1380284923221817856","@type":"Researcher","foaf:name":[{"@value":"T. Hirokawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380284923221817859","@type":"Researcher","foaf:name":[{"@value":"F. De Martin"}]},{"@id":"https://cir.nii.ac.jp/crid/1380284923221817860","@type":"Researcher","foaf:name":[{"@value":"H. Kawase"}]},{"@id":"https://cir.nii.ac.jp/crid/1380284923221817857","@type":"Researcher","foaf:name":[{"@value":"F. J. Sanchez-Sesma"}]}],"contributor":[{"@id":"https://cir.nii.ac.jp/crid/1893398392826711425","@type":"Researcher","foaf:name":[{"@value":"Yamashita Sekkei Inc ; Yamashita Sekkei Inc"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711434","@type":"Researcher","foaf:name":[{"@value":"Internal funding from Bureau des Recherches Géologiques et Minières (BRGM)"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711432","@type":"Researcher","foaf:name":[{"@value":"Disaster Prevention Research Institute (DPRI) ; Kyoto University"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711426","@type":"Researcher","foaf:name":[{"@value":"Disaster Prevention Research Institute (DPRI) ; Kyoto University [Kyoto]"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711429","@type":"Researcher","foaf:name":[{"@value":"Bureau de Recherches Géologiques et Minières (BRGM)"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711437","@type":"Researcher","foaf:name":[{"@value":"Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711435","@type":"Researcher","foaf:name":[{"@value":"Instituto de Ingeniería [Mexico] ; Universidad Nacional Autónoma de México (UNAM)"}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711424","@type":"Researcher","foaf:name":[{"@value":"DPRI project \"Leading International Cooperative Research of Integrated Disaster Science on Evolving Natural Hazards\" under the JSPS program \"Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation.\""}]},{"@id":"https://cir.nii.ac.jp/crid/1893398392826711431","@type":"Researcher","foaf:name":[{"@value":"Instituto de Ingeniería [Mexico] ; Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM)"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00371106"}],"prism:publicationName":[{"@value":"Bulletin of the Seismological Society of America"}],"dc:publisher":[{"@value":"Seismological Society of America (SSA)"}],"prism:publicationDate":"2014-01-21","prism:volume":"104","prism:number":"1","prism:startingPage":"381","prism:endingPage":"393"},"reviewed":"false","url":[{"@id":"https://syndication.highwire.org/content/doi/10.1785/0120120321"}],"createdAt":"2014-02-03","modifiedAt":"2017-11-03","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=%5BSDU.OTHER%5DSciences%20of%20the%20Universe%20%5Bphysics%5D/Other","dc:title":"[SDU.OTHER]Sciences of the Universe [physics]/Other"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040282257232255488","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"25420577"},{"@type":"JGN","@value":"JP25420577"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25420577/"}],"notation":[{"@language":"ja","@value":"微動の水平上下スペクトル比に基づく不整形地盤構造同定手法の開発"},{"@language":"en","@value":"Development of a Method to Identify the Heterogeneous Subsurface Structure based on the Horizontal-to-Vertical Spectral Ratio of Microtremors"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001335851936000","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Directionally dependent horizontal-to-vertical spectral ratios of microtremors at Onahama, Fukushima, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1050001338209108864","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Difference of horizontal-to-vertical spectral ratios of observed earthquakes and microtremors and its application to S-wave velocity inversion based on the diffuse field concept"}]},{"@id":"https://cir.nii.ac.jp/crid/1360294643757395584","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"New method to estimate bedrock shape of 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Maps"},{"@language":"ja","@value":"地形発達史が異なる地形区の常時微動H/Vスペクトル比と堆積層厚の関係"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1785/0120120321"},{"@type":"KAKEN","@value":"PRODUCT-15056984"},{"@type":"OPENAIRE","@value":"doi_dedup___::a43cac3e4dbf84dae37fac3202b93acb"},{"@type":"CROSSREF","@value":"10.1186/s40623-017-0766-4_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.21.5_1_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.22.3_58_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.16.2_74_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.1016/j.soildyn.2021.106882_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.1186/s40623-017-0680-9_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.16.1_19_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.20965/jdr.2025.p0628_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.14.2_104_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.16.9_13_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.3130/aijs.81.1983_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.15.7_60_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.19.5_136_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"},{"@type":"CROSSREF","@value":"10.5610/jaee.20.8_19_references_DOI_WIRB3RUrqtW3bppdJhSmabtCzPn"}]}