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磐梯山1888年噴火によるサージ堆積物と被災記録
http://hdl.handle.net/10097/41091
http://hdl.handle.net/10097/410910aa3dde2-a546-4ef3-a66b-72b9a0af6b35
名前 / ファイル | ライセンス | アクション |
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KJ00004380624.pdf (2.2 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2010-02-05 | |||||
タイトル | ||||||
タイトル | 磐梯山1888年噴火によるサージ堆積物と被災記録 | |||||
言語 | ||||||
言語 | jpn | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 磐梯山 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 火砕サージ | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 噴火推移 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 被災記録 | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
著者 |
紺谷, 和生
× 紺谷, 和生× 谷口, 宏充 |
|||||
著者別名 | ||||||
姓名 | KONTANI, Kazuo | |||||
著者別名 | ||||||
姓名 | TANIGUCHI, Hiromitsu | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Mt. Bandai (Bandai-san), famous for the large-scale collapse of a volcanic edifice triggered by a phreatic eruption on July 15, 1888, is an active volcano in Fukushima Prefecture. The phreatic eruption produced a pyroclastic surge, and which hit villages on the eastern foot of Mt. Bandai. Precious studies have focused on the surge deposit, and have showed the characteristics of the pyroclastic surge and yielded an eruption model. However, there are many paradoxes between the models arrived at and the disaster records. For example, there are the paradoxes of the timing of the generation, the number of flow units, and the depositional area of the pyroclastic surge. In this study, we compare the surge deposits with disaster records, and discuss the pyroclastic surges of the 1888 eruption. The 1888 Mt. Bandai eruption has six characteristics: (1) no significant precursor; (2) phreatic explosions produced pyroclastic surges; (3) the collapse of a volcanic edifice was triggered by proceeding explosions; (4) the main activity ceased within a few hours after the first eruption; (5) no amount of essential material in the 1888 deposit. The surge deposit of the 1888 eruption is made up of massive or cross-laminated beds with reverse or normal grading of pyroclastic materials. The deposit tends to distribute more thickly on the topographically low land. Sometimes accretionary lapilli and pieces of non-carbonizing wood are contained in the deposit. The depositional structure and the pattern of the size distribution of the deposit are in good agreement with those of a typical surge deposit. We found the surge deposit on the debris avalanche deposit, which gave us new evidence for understanding the past. Microscopic and X-ray diffraction investigations indicate that some layers in the deposit have different components, including the fresh fragments of basement granite. Based on this evidence, we concluded that the 1888 surge had plural flow units with different origins. Some of these flows had wet conditions, and the depositional temperature was relatively low. Since many inhabitants survived the disaster of the surge, many testimonies and records have been accumulated. According to these; (1) after the sound of the eruption, it took several dozen seconds for the surge to reach the foot of the mountain which was about 5km distant; (2) some victims were burnt; (3) some victims were overcome two times by the surges. Based on the character of the surge deposit and the summary of the victims' testimony regarding the timing, it was concluded that a surge was generated at least twice; before and after the collapse of the volcanic edifice. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 論文 | |||||
書誌情報 |
東北アジア研究 en : Northeast Asian studies 号 8, p. 71-90, 発行日 2004-03-19 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1343-9332 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11158374 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
その他の言語のタイトル | ||||||
その他のタイトル | Surge Deposits and Disaster Record induced by Mt. Bandai 1888 Eruption | |||||
出版者 | ||||||
出版者 | 東北大学東北アジア研究センター | |||||
出版者 | ||||||
出版者 | publisher | |||||
資源タイプ | ||||||
内容記述タイプ | Other | |||||
内容記述 | 紀要類 | |||||
登録日 | ||||||
日付 | 2010-02-05 | |||||
日付タイプ | Created | |||||
公開日(投稿完了日) | ||||||
日付 | 2010-02-05 | |||||
日付タイプ | Created | |||||
発行日 | ||||||
日付 | 2004-03 | |||||
日付タイプ | Created | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | 2180515 bytes | |||||
公開範囲 | ||||||
値 | 学外 | |||||
著者所属 | ||||||
東北大学大学院理学研究科 / 東北大学東北アジア研究センター | ||||||
更新日 | ||||||
日付 | 2010-02-05 | |||||
日付タイプ | Created |