It is important to clarify the structure and constituent minerals of a fault zone in order to evaluate fault activity. Thus, we conducted a detailed structural analysis of a fault zone of the Yamada fault, observed in a granite outcrop, to understand the characteristics of active and inactive faults during the Quaternary.
The fault zone consisted of fault gouge zone, fault breccia, and cataclasite, and included a main fault plane and several minor fault planes. The main fault plane cut unconsolidated sediment layers and was associated with the fault gouge zone. The fault gouge zone exhibited a layered structure with 10 fault gouge layers characterized by composite planar fabrics indicating dextral slip and composed mainly of smectite. Thus, we infer that the gouge zone was formed after smectite crystallization by repetitive slip in the shallow part of the crust. The minor fault planes showed no clear relationship with the unconsolidated sediment layers in the outcrop; further, they were not associated with fault gouge, and were in direct contact with the cataclasite. Within the cataclasite, biotite that had been plastically deformed in the deep part of crust was recognized, and no structures indicating fault activity in the shallow part of crust were observed. Thus, we infer that the minor fault planes have been inactive during the Quaternary.
"},{"@language":"ja","@value":"断層破砕帯の構造や構成鉱物を明らかにすることは，断層の活動性を評価するために重要である．そこで，活断層と第四紀以降に活動していない断層の特徴を把握するため，花崗岩露頭中に発達する山田断層の破砕帯を対象に詳細な構造解析を実施した．
山田断層の破砕帯は断層ガウジ帯や，断層角礫，カタクレーサイトから構成され，主断層面や数条の小断層面が認められる．主断層面は未固結堆積層を切り，断層ガウジ帯を伴う．断層ガウジ帯は10枚の断層ガウジからなる層状構造を呈する．この10枚の断層ガウジは右横ずれ剪断（せんだん）運動を示す複合面構造を呈し，主にスメクタイトからなるため，スメクタイト生成後の地殻浅部での繰り返し剪断運動により，断層ガウジ帯が形成されたと考えられる．小断層面は未固結堆積層との関係が不明で，断層ガウジを伴わず，カタクレーサイトと接する．カタクレーサイト中には，地殻深部で塑性変形した黒雲母が認められ，地殻浅部の活動を示す構造は見られないため，この小断層面は第四紀以降に活動していないと考えられる．
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410282679070999937","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000391395535"}],"foaf:name":[{"@language":"ja","@value":"相山 光太郎"},{"@language":"en","@value":"AIYAMA Kotaro"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Central Research Institute of Electric Power Industry"},{"@language":"ja","@value":"電力中央研究所"}]},{"@id":"https://cir.nii.ac.jp/crid/1410282679070999936","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000391395536"}],"foaf:name":[{"@language":"ja","@value":"田中 姿郎"},{"@language":"en","@value":"TANAKA Shiro"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Central Research Institute of Electric Power Industry"},{"@language":"ja","@value":"電力中央研究所"}]},{"@id":"https://cir.nii.ac.jp/crid/1030285133729426441","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000003065138"}],"foaf:name":[{"@language":"ja","@value":"佐々木 俊法"},{"@language":"en","@value":"SASAKI Toshinori"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Central Research Institute of Electric Power Industry"},{"@language":"ja","@value":"電力中央研究所"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"02867737"},{"@type":"EISSN","@value":"18840973"}],"prism:publicationName":[{"@language":"ja","@value":"応用地質"},{"@language":"en","@value":"Journal of the Japan Society of Engineering Geology"},{"@language":"en","@value":"Journal of the Japan Society of Engineering Geology"},{"@language":"en","@value":"JJSEG"},{"@language":"en","@value":"Jour. Japan Soc. Eng. Geol."},{"@language":"ja","@value":"応用地質"}],"dc:publisher":[{"@language":"en","@value":"Japan Society of Engineering Geology"},{"@language":"ja","@value":"一般社団法人 日本応用地質学会"}],"prism:publicationDate":"2017","prism:volume":"58","prism:number":"1","prism:startingPage":"2","prism:endingPage":"18"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"https://www.jstage.jst.go.jp/article/jjseg/58/1/58_2/_pdf"}],"availableAt":"2017","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=%E6%B4%BB%E6%96%AD%E5%B1%A4","dc:title":"活断層"},{"@id":"https://cir.nii.ac.jp/all?q=%E5%B1%B1%E7%94%B0%E6%96%AD%E5%B1%A4","dc:title":"山田断層"},{"@id":"https://cir.nii.ac.jp/all?q=%E6%96%AD%E5%B1%A4%E3%82%AC%E3%82%A6%E3%82%B8","dc:title":"断層ガウジ"},{"@id":"https://cir.nii.ac.jp/all?q=%E5%B1%A4%E7%8A%B6%E6%A7%8B%E9%80%A0","dc:title":"層状構造"},{"@id":"https://cir.nii.ac.jp/all?q=active%20fault","dc:title":"active 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