{"created":"2023-12-01T01:22:48.232504+00:00","id":2000069,"links":{},"metadata":{"_buckets":{"deposit":"7aca3bf2-f586-4126-bfec-52e6183ef087"},"_deposit":{"created_by":14,"id":"2000069","owners":[14],"pid":{"revision_id":0,"type":"depid","value":"2000069"},"status":"published"},"_oai":{"id":"oai:tokyo-metro-u.repo.nii.ac.jp:02000069","sets":["465:475:478:479:1701390537003"]},"author_link":[],"item_30002_bibliographic_information29":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2023-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"69","bibliographicPageStart":"45","bibliographicVolumeNumber":"49","bibliographic_titles":[{"bibliographic_title":"小笠原研究","bibliographic_titleLang":"ja"},{"bibliographic_title":"Ogasawara research","bibliographic_titleLang":"en"}]}]},"item_30002_creator2":{"attribute_name":"作成者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"長井, 雅史","creatorNameLang":"ja"},{"creatorName":"NAGAI, Masashi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"前野, 深","creatorNameLang":"ja"},{"creatorName":"MAENO, Fukashi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"金子, 隆之","creatorNameLang":"ja"},{"creatorName":"KANEKO, Takayuki","creatorNameLang":"en"}]}]},"item_30002_description9":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"令和3年度の総合学術調査により、2020年以降の西之島噴火の火砕堆積物の岩相と分布の概略を把握し、予察的な岩石学的分析を行った。2019-2020年(第4期)の噴火活動では、安山岩質溶岩の流出主体の噴火から、玄武岩質安山岩マグマによるバイオレント・ストロンボリ式噴火に変化したことが知られているが、今回の調査では化学組成の変化と噴火様式の変化が同時期であったことがより明瞭になった。また、バイオレント・ストロンボリ式噴火に転じたのちは、脆性的な破砕が特徴的な灰噴火ないし水蒸気マグマ噴火に遷移したことが明らかになった。2021年8月14日の噴火も噴出物の特徴が第4期火砕堆積物と類似するため、同様な噴火様式であったと考えられる。","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"Through the Nishinoshima comprehensive scientific research project in 2021, we examined the outline of distribution and lithological profiles of the pyroclastic deposits of Nishinoshima volcano after eruption in 2019–2020 (Episode 4), and conducted a preliminary petrological analysis. The 2019–2020 eruption activity changed from andesitic lava outflow to basaltic–andesitic violent strombolian eruption within the period. In the survey conducted, it became clearer that the changes in chemical composition and eruption style occurred around the same time. After a continuation of the violent strombolian eruption, the eruption style changed furthermore to ash eruption or phreatomagmatic eruption, which is characterized by the brittle fragmentation of pyroclastic materials. The eruption style on August 14, 2021 (the first eruption of Episode 5) was inferred to be similar to the late stage of Episode 4, because of their similar ash deposit characteristics.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_30002_file35":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2023-11-28"}],"displaytype":"detail","filename":"20001-049-002.pdf","format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://tokyo-metro-u.repo.nii.ac.jp/record/2000069/files/20001-049-002.pdf"},"version_id":"dccab426-006c-4f3e-aac1-8787d7ae78f6"}]},"item_30002_language12":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_30002_publisher10":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京都立大学小笠原研究委員会","subitem_publisher_language":"ja"}]},"item_30002_resource_type13":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_30002_source_identifier22":{"attribute_name":"収録物識別子","attribute_value_mlt":[{"subitem_source_identifier":"03868176","subitem_source_identifier_type":"PISSN"},{"subitem_source_identifier":"AN00032332","subitem_source_identifier_type":"NCID"}]},"item_30002_subject8":{"attribute_name":"主題","attribute_value_mlt":[{"subitem_subject":"安山岩","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"火砕堆積物","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"噴火様式","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"Andesite","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Eruption style","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Pyroclastic deposit","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_30002_title0":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"2021年に実施された西之島総合学術調査における火山地質学的知見","subitem_title_language":"ja"},{"subitem_title":"Geological findings in the 2021 Nishinoshima comprehensive scientific research project","subitem_title_language":"en"}]},"item_30002_version_type15":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_title":"2021年に実施された西之島総合学術調査における火山地質学的知見","item_type_id":"30002","owner":"14","path":["1701390537003"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-11-28"},"publish_date":"2023-11-28","publish_status":"0","recid":"2000069","relation_version_is_last":true,"title":["2021年に実施された西之島総合学術調査における火山地質学的知見"],"weko_creator_id":"14","weko_shared_id":-1},"updated":"2023-12-11T02:53:42.348722+00:00"}