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• Geoecological system and education on karst landforms

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Published Papers 【 display / non-display 】

• Geosites of Yonaguni Island Located at the Westernmost Point of Japan

  Takayuki Ogata

  E-journal GEO   15 ( 1 ) 44 - 54   2020.02 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

• Geosites of Yonaguni Island Located at the Westernmost Point of Japan

  Takayuki OGATA, Makoto OTSUBO, Hideyuki ITOH

  E-journal GEO ( The Association of Japanese Geographers )  15 ( 1 ) 44 - 54   2020

  Type of publication: Research paper (scientific journal)

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  <p>Yonaguni Island is located in the westernmost Ryukyu arc, where the geological setting extends to the Taiwan central range and the Luzon volcanic arc, along the subduction zone between the Eurasian and Philippine Sea plates. This paper reports the results of landform analyses based on the 10 m Digital Elevation Model and field observation at outcrops of three geosites. Miocene sandstone (Yaeyama Group) is broadly exposed on the island surface which forms low-altitude mountains and hills (maximum elevation 231 m).Pleistocene limestone (Ryukyu Group) partly covers the Yaeyama Group and forms uplifted marine terraces composed mainly of coral reef sediments. This paper focuses on three geosites: Tindabana; Kubura-furishi; and Sanninu-dai. Tindabana is a cliff including unconformity of the Yaeyama Group sandstone and Ryukyu Group limestone, producing groundwater discharge, springs, and notches. Kubura-furishi is a rocky coast consisting of a shore platform and cliffs made of the Yaeyama Group sandstone forming remarkable tafoni. Sanninu-dai shows normal faults and many joints derived from horizontal stresses. These geosites indicate geomorphic processes in isolated island environments and suggest landform development in relation to back-arc tectonics. Yonaguni Island presents an interesting field for geotourism and border tourism in collaboration with Taiwan.</p>

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• Geoscientific studies on the Quaternary faulting and geomorphic processes of the Ryukyu arc, southwestern Japan

  Ogata Takayuki, Otsubo Makoto

  The Quaternary Research (Daiyonki-Kenkyu) ( Japan Association for Quaternary Research )  58 ( 6 ) 377 - 395   2019.12

  Type of publication: Research paper (scientific journal)

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  <p>This paper reviews studies on the Quaternary tectonics and geomorphic processes of the Ryukyu arc, southwestern Japan. The Ryukyu arc lies along the subduction zone between the Eurasia and Philippine sea plates. Many islands of the Ryukyu arc are classified into volcanic islands, accretionary complex islands and uplifted coral reef islands. The Quaternary tectonics forms many strike-slip and normal faults in the Pleistocene limestone (Ryukyu group) originating from coral reef sediments. Mountains and hills consisting of metamorphic and sedimentary rocks are eroded, reflecting the rate of weathering controlled by various environmental conditions. Previous physiographic studies considered several landforms as tropical and subtropical landscapes, whereas such landforms should be reconsidered in terms of geological factors as well as climatic ones. The authors suggest that future studies require a more comprehensive and integrated understanding of the geomorphic processes involving both the climatic and geological factors.</p>

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• Geoscientific studies on the Quaternary faulting and geomorphic processes of the Ryukyu arc, southwestern Japan

  Takayuki Ogata, Makoto Otsubo

  The Quaternary Research   58 ( 6 ) 377 - 395   2019.12 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  This paper reviews studies on the Quaternary<br /> tectonics and geomorphic processes of the Ryukyu arc, southwestern Japan. The Ryukyu arc lies along the subduction zone between the Eurasia and Philippine sea plates. Many islands of the Ryukyu arc are classified into volcanic islands, accretionary complex islands and uplifted coral reef islands. The Quaternary tectonics forms many strike-slip and normal faults in the Pleistocene limestone (Ryukyu group) originating from coral reef sediments. Mountains and hills consisting of metamorphic and sedimentary rocks are eroded, reflecting the rate of weathering controlled by various environmental conditions. Previous physiographic studies considered several<br /> landforms as tropical and subtropical landscapes, whereas such landforms should be reconsidered in terms of geological factors as well as climatic ones. The authors suggest that future studies require a more comprehensive and integrated understanding of the geomorphic processes involving both the climatic and geological factors.

• A Geotour Program of Kikai Island, Kagoshima Prefecture, Japan

  Ogiwara Kazumi, Ogata Takayuki

    ( 9 ) 27 - 34   2015.03 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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Other Papers 【 display / non-display 】

Other Papers 【 display / non-display 】

• Geoscientific Sites and Story of Kikai Island, Located among the Amami Islands, Japan

  Takayuki Ogata

  Journal of Geography ( Tokyo Geographical Society )  124 ( 1 ) v - v   2015  [Refereed]

   

  DOI

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Mapping and Spatial Analyses for Hazard Prediction of Glacial Lake Outburst Floods in the Himalaya-Karakorum-Hindukush Ranges

  Laiba Salman, Takayuki Ogata

  日本地球惑星科学連合2023年大会（領域外・複数領域ジョイントセッション）  2023.05  -  2023.05 

• Geoscientific Setting and Educational Significances of Iheya Island in the Ryukyu Arc, Eastern Asia

  尾方 隆幸, 菅森 義晃, 小玉 芳敬

  日本地球惑星科学連合2023年大会（領域外・複数領域ジョイントセッション）  2023.05  -  2023.05 

• Geotourism during the COVID-19 Pandemic

  Takayuki Ogata

  Japan Geoscience Union 2022 Meeting  2022.05  -  2022.05 

• Landform Analyses of Granite Mountains in Northeast Japan: Reconsideration of Uplifted Peneplain in Abukuma Mountains

  Taichi Hiraoka, Takayuki Ogata

  Japan Geoscience Union 2022 Meeting  2022.05  -  2022.05 

• Geohazard and geomorphology

  Takayuki Ogata

  2021.08  -  2021.08 

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• Grant-in-Aid for Scientific Research(C)

  Project Year: 2014  -  2017 

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Media Coverage 【 display / non-display 】

Media Coverage 【 display / non-display 】

• 連載：TVに登場した地理学者にきく（第11回）  Newspaper, magazine

  古今書院  地理  68(5)  2023.5

• 与那国島「謎に包まれた海底伝説」  TV or radio program

  テレビ東京  所でナンじゃこりゃ！？  2023.3

• 特集「ジオ琉球の旅」～沖縄本島～  Newspaper, magazine

  日本トランスオーシャン航空  Coralway (No. 204)  2023.1

• 体感グレートネイチャー 〜鹿児島・沖縄1200km〜  TV or radio program

  NHK  グレートネイチャー  2022.11

• 連載「ジオサイト紀行：島々の多様性」  Newspaper, magazine

  沖縄タイムス  2022

  Author： Myself 

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