{"created":"2021-03-01T06:51:27.625949+00:00","id":32754,"links":{},"metadata":{"_buckets":{"deposit":"14dbb4a3-7a37-4071-8c9a-926a9e31e6c2"},"_deposit":{"id":"32754","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"32754"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00032754","sets":["80:4535:4717:4725","9:504:4538:4719:4726"]},"author_link":["127304","127305","127306","127307","127308","127299","127300","127301","127302","127303"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"DELP 1988年度沖繩トラフ海域研究航海報告 : 2. 沖縄トラフ南西部における反射法地震探査"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1991-06-28","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"36","bibliographicPageStart":"17","bibliographicVolumeNumber":"66","bibliographic_titles":[{"bibliographic_title":"東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]},"item_4_description_13":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Multi- and single-channel seismic reflection profiles along four track lines in the southwestern part of the Okinawa Trough were obtained during the 1988 DELP cruise. The trough is a back-arc depression located between the Ryuku Arc and the shallow shelf of the East China Sea. The acoustic sequence in the trough can be divided into three units depending mainly on the varying degrees of deformation and reflection character. Widespread deformation by normal faulting is especially developed in the lowest unit which displays horst and graben structures. The deformation would have originated at about the Plio-Pleistocene boundary and formed the prototype of the trough. Reflectors observed within the upper unit show the tilting and subsidence of the trough floor, and essentially no deformation by faulting except for the Yaeyama Graben area located in the axial part of the trough. Just along the Yaeyama Graben, rifting and subsidence with normal faulting are in progress. Some volcanic intrusions observed in the Yaeyama Graben indiccate that the bimodal and/or island-arc type volcanisms have occurred. These tectonic events suggest that the origin of the trough is the continental rifting and that the trough is in a state of the rifting stage. Also, the events suggest that the back-arc spreading might have recently initiated only in the Yaeyama Graben.","subitem_description_type":"Abstract"},{"subitem_description":"1988年7月,沖縄トラフ南西部を中心にDELP研究航海が実施された.本航海では,トラフ南西部を南北に横断する4測線において反射法地震探査が行われた.その結果,トラフに分布する音響層は,正断層による変形の程度および堆積構造から,前期中新世から現在までに堆積したと考えられる3層準に区分される.広域かつ規模の大きい変形が認められるのは,トラフ底において島尻層群に相当すると考えられる音響基盤である.上位の堆積層中に発達する反射面は,トラフの中軸部に向って傾動しており,トラフ底全体が沈降を続けてきたことが推定される.トラフの中軸部には,現在も活動的であると思われる正断層によって形成された明瞭な海底地溝が認められる.この海底地溝に沿った断層に伴うトラフ底の沈降は,特に顕著なものであり,往復走時で2.5秒を越える堆積物が認められる.地震探査記録に認られたこれらの構造から,沖縄トラフ南西部の形成は大陸地殻のriftingによるものであることが示唆される.また,その形成は,おもに第四紀以降に行われたことが推定される.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"127304","nameIdentifierScheme":"WEKO"}],"names":[{"name":"古川, 雅英"}]},{"nameIdentifiers":[{"nameIdentifier":"127305","nameIdentifierScheme":"WEKO"}],"names":[{"name":"徳山, 英一"}]},{"nameIdentifiers":[{"nameIdentifier":"127306","nameIdentifierScheme":"WEKO"}],"names":[{"name":"阿部, 信太郎"}]},{"nameIdentifiers":[{"nameIdentifier":"127307","nameIdentifierScheme":"WEKO"}],"names":[{"name":"西沢, あずさ"}]},{"nameIdentifiers":[{"nameIdentifier":"127308","nameIdentifierScheme":"WEKO"}],"names":[{"name":"木下, 肇"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000032754","subitem_identifier_reg_type":"JaLC"}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学地震研究所"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162258","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00408972","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"453","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"Earthquake Research Institute, University of Tokyo"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"Department of Earth Sciences, Kobe University"},{"subitem_text_value":"Ocean Research Institute, University of Tokyo"},{"subitem_text_value":"Deparment of Earth Sciences, Chiba University"},{"subitem_text_value":"Observation Center for Predictions of Earthquakes and Volcanic Eruption, Tohoku University"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Furukawa, Masahide"}],"nameIdentifiers":[{"nameIdentifier":"127299","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tokuyama, Hidekazu"}],"nameIdentifiers":[{"nameIdentifier":"127300","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Abe, Shintaro"}],"nameIdentifiers":[{"nameIdentifier":"127301","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nishizawa, Azusa"}],"nameIdentifiers":[{"nameIdentifier":"127302","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kinoshita, Hajimu"}],"nameIdentifiers":[{"nameIdentifier":"127303","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-26"}],"displaytype":"detail","filename":"ji0661002.pdf","filesize":[{"value":"3.9 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0661002.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/32754/files/ji0661002.pdf"},"version_id":"9495681c-0ea2-40e6-be2a-5b7aa6191794"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Report on DELP 1988 Cruises in the Okinawa Trough : Part 2. Seismic Reflection Studies in the Southwestern Part of the Okinawa Trough","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Report on DELP 1988 Cruises in the Okinawa Trough : Part 2. Seismic Reflection Studies in the Southwestern Part of the Okinawa Trough","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["4725","4726"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2009-10-13"},"publish_date":"2009-10-13","publish_status":"0","recid":"32754","relation_version_is_last":true,"title":["Report on DELP 1988 Cruises in the Okinawa Trough : Part 2. Seismic Reflection Studies in the Southwestern Part of the Okinawa Trough"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:08:44.884158+00:00"}