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トカラ列島中之島御岳に分布する階状土
http://hdl.handle.net/11266/00010874
http://hdl.handle.net/11266/0001087466b34528-7d45-4c3d-a8f0-ceda3b97d670
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
RS044-2.73-80.shimazu et.al.pdf (964.0 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2022-02-22 | |||||
| タイトル | ||||||
| タイトル | トカラ列島中之島御岳に分布する階状土 | |||||
| タイトル | ||||||
| タイトル | Turf-banked terraces on the Crater Rim of the Otake Volcano, Nakanoshima Island, Kagoshima Prefecture, Southern Japan | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 主題 | 階状土, 周氷河地形, トカラ列島, 中之島, 完新世, Turf-banked terraces, extrazonal periglacial landforms, Tokara Islands, Southern Japan, Holocene | |||||
| 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 |
島津, 弘
× 島津, 弘× 西, 克幸× 平柳, 聡× 小川, 司× 森岡, 大輔× SHIMAZU, Hiroshi× NISHI, Katsuyuki× HIRAYANAGI, Satoshi× OGAWA, Tsukasa× MORIOKA, Daisuke |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The authors found turf-banked terraces at about 930 m altitude on the crater rim of the Otake Volcano, Nakanoshima Island, Kagoshima Prefecture, southern Japan. Because this island is located at latitude 29° 50' N, these turf-banked terraces are the most southern examples of patterned ground (extrazonal periglacial landforms) in Japan. In this paper, the authors describe the features of the turf-banked terraces, show rough sketches, and examine the climatic conditions which may be responsible for their formation. The length and width of each terrace is 1-1.5 m and 2-3 m respectively and the height of each step is 30-60 cm. The slope of the terraced area is 15-20 degrees. The steps are covered with vegetation: Rhododendron simsii Planch. var. tamurae (Mak.) Kaneh. & Hatusima and Miscanthus sinensis Andress. var. condensatus (hack.) Mak. The Younger Otake Volcano is an active volcano which has erupted repeatedly since the late Pleistocene. The terraced area is underlain by pyroclastic rocks from an eruption at ca. 3000 y. B. P. This area has been treeless for a long time due to volcanic eruptions and strong winds. These are favorable conditions for the formation of terraces. Climatic conditions are estimated based on the observed temperatures from an AMeDAS (Automatic Meteorological Data System) station at 220m on Nakanoshima Island. Estimated temperatures for the terraced area indicate only a few freeze-thaw cycles during one winter. It appears that the freeze-thaw action is too weak to form the terraces. During a recent cool period, the Little Ice Age, estimated winter temperature in Japan decreased by 0.5-2 ℃ so more active freeze-thaw action likely occurred during that period. Further, deposition of pyroclastic rocks at ca. 3000 y. B. P. caused bare land and an unstable surface. Global cooling also occurred at that time. A combination of cooler climate, treeless conditions and the deposition of unstable deposits seems to have caused the periglacial landforms to form even at such a southern location in Japan. | |||||
| 内容記述 | ||||||
| 内容記述 | 研究ノート | |||||
| 書誌情報 |
地域研究 en : REGIONAL STUDIES 巻 44, 号 2, p. 73-80, 発行日 2004-02-12 |
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| その他の巻号 | ||||||
| 79 | ||||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 03896641 | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 出版者 | ||||||
| 出版者 | 立正地理学会 | |||||
