{"@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/1390282679280458624.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.4294/zisin1948.34.4_465"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/zisin1948/34/4/34_4_465/_pdf"}},{"identifier":{"@type":"NAID","@value":"130006784668"}}],"dc:title":[{"@language":"ja","@value":"やや深い構造のS波速度 (III)"},{"@language":"en","@value":"Shear Wave Velocities in Deep Soil Deposits. Part III"}],"dcterms:alternative":[{"@language":"ja","@value":"府中2,750m観測井における測定とまとめ"},{"@language":"en","@value":"Measurements in the Borehole of the Fuchu Observatory to the Depth of 2, 750m and a Summary of the Results"}],"description":[{"type":"abstract","notation":[{"@language":"en","@value":"Continued to previous works at Iwatsuki and Shimohsa, S wave velocities in deep soil deposits were measured by using the observation well at the Fuchu Deep-Borehole Crustal Activity Observatory of the National Research Center for Disaster Prevention, Japan.<br>Measurements were conducted at 17 different depths to the borehole bottom with the depth of 2, 750m at intervals of 100-250m. S waves were excited by the SH wave generator on the ground surface. The excited waves were observed by a set of three component seismometers assembled into the specially designed capsule. The capsule can fix itself to the borehole wall at any depths.<br>The measurement revealed that the deposit at the Fuchu is fundamentally composed of three layers which covers the basement rocks. S wave velocities of those layers are, from the top to the bottom, 0.54, 0.78, and 1.19km/sec, and that of the substratum is 2.54km/sec. The velocity structure, including the P wave one, is consistent with such data as geologic section, sonic velocity, bulk density, and electric resistivity loggings of the observation well.<br>Through a comparison of thus obtained structures at three separate sites, Iwatsuki, Shimohsa, and Fuchu, one can visualize the underground structure three dimensionally, though vaguely and restricted in the Tokyo metropolitan area. A relation between the seismic wave velocity and the geological condition is also obtained. The relation is useful to estimate the velocity structure at deep-wells which were bored for the purpose of the geological investigation. Finally, it is found that the P wave velocity of the basement obtained from our direct method is rather small compared with the one from the refraction method. The difference is confirmed to be meaningful. It seems to be caused from the basement structure, that is, the basement is not uniform but has a thin layer at its top. The velocity difference between this layer and the lower basement is so small that the upper-most layer is masked in the ordinary refraction exploration."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410282679280458624","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000391401952"}],"foaf:name":[{"@language":"ja","@value":"山水 史生"},{"@language":"en","@value":"YAMAMIZU Fumio"}],"jpcoar:affiliationName":[{"@language":"en","@value":"National Research Center for Disaster Prevention"},{"@language":"ja","@value":"国立防災科学技術センター"}]},{"@id":"https://cir.nii.ac.jp/crid/1410001204303474822","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000391401165"}],"foaf:name":[{"@language":"ja","@value":"高橋 博"},{"@language":"en","@value":"TAKAHASHI Hiroshi"}],"jpcoar:affiliationName":[{"@language":"en","@value":"National Research Center for Disaster 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典俊"},{"@language":"en","@value":"GOTO Noritoshi"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Faculty of Engineering, Hokkaido 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裕"},{"@language":"en","@value":"OHTA Yutaka"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Faculty of Engineering, Hokkaido University"},{"@language":"ja","@value":"北海道大学工学部建築工学教室"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00371114"},{"@type":"LISSN","@value":"00371114"},{"@type":"EISSN","@value":"18839029"},{"@type":"EISSN","@value":"2186599X"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/00371114"}],"prism:publicationName":[{"@language":"en","@value":"Zisin (Journal of the Seismological Society of Japan. 2nd ser.)"},{"@language":"ja","@value":"地震　第２輯"},{"@value":"地震　第2輯"},{"@language":"ja","@value":"地震"},{"@language":"ja","@value":"地震　第２輯"},{"@language":"en","@value":"JSSJ"},{"@language":"en","@value":"Zisin"},{"@language":"en","@value":"BSSJ"},{"@language":"en","@value":"Zisin (Journal of the Seismological Society of Japan. 2nd ser.)"},{"@language":"en","@value":"Zisin1"},{"@language":"ja","@value":"地震１"},{"@language":"ja","@value":"地震　第１輯"}],"dc:publisher":[{"@language":"en","@value":"SEISMOLOGICAL SOCIETY OF JAPAN"},{"@language":"ja","@value":"公益社団法人 日本地震学会"}],"prism:publicationDate":"1981","prism:volume":"34","prism:number":"4","prism:startingPage":"465","prism:endingPage":"479"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"https://www.jstage.jst.go.jp/article/zisin1948/34/4/34_4_465/_pdf"}],"availableAt":"1981","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1390001205601771008","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"SPECTRAL CHARACTERISTICS OF BEDROCK MOTION IN THE TOKYO METROPOLITAN 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PREDICTION OF GROUND MOTION INTENSITY IN NEAR SOURCE REGION FROM LARGE EVENTS"},{"@language":"ja-Kana","@value":"ジシンドウ ツヨサ オ ヒョウカスル ケイケンシキ ノ ダイジシン ダンソウ"}]},{"@id":"https://cir.nii.ac.jp/crid/2051151842060099712","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Estimating errors in autocorrelation functions for reliable investigations of reflection 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