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• Geoecological system and education on karst landforms

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Neotectonics in Ryukyu arc-Future works on processes of uplift and subsidence

  Makoto Otsubo, Takayuki Ogata

    130 ( 1 ) 153 - 165   2024.05 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

• Neotectonics in Ryukyu arc-Future works on processes of uplift and subsidence-

  Otsubo Makoto, Ogata Takayuki

  The Journal of the Geological Society of Japan ( The Geological Society of Japan )  130 ( 1 ) 153 - 165   2024

  Type of publication: Research paper (scientific journal)

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  <p>We review the timing, mode, and topographic development of the Ryukyu Arc from the viewpoint of Quaternary crustal deformation. We also discuss the uplift and subsidence trends of the island region of the Ryukyu Arc, and the timing and mechanism of formation of depressions (Tokara Tectonic Strait, Kerama Gap, and Yonaguni Depression) that divide the island region of the Ryukyu Arc. The strikes of normal faults in the Tokara Tectonic Strait and Kerama Gap differ from those in the Yonaguni Depression. The timing of uplift and subsidence is spatially variable throughout the island region of the Ryukyu Arc. Future work will focus on neotectonics, geomorphic processes and landform development in the context of neotectonics, and the ongoing tectonic evolution of the island arc.</p>

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• Geomorphic Analyses of Low-relief Landforms and Reconsideration of Uplifted Peneplain in the Abukuma Mountains, Northeast Japan

  Taichi HIRAOKA, Takayuki OGATA

  E-journal GEO ( The Association of Japanese Geographers )  19 ( 1 ) 15 - 28   2024

  Type of publication: Research paper (scientific journal)

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  <p>An uplifted peneplain is a geomorphic stage of the classical model of the “cycle of erosion" proposed by W. M. Davis, although recent geomorphic studies suggest that low-relief mountains and hills in Japan should be reconsidered based on quantitative landform analyses. This study discusses the low-relief landforms considered to be uplifted peneplains of the Abukuma Mountains in northeast Japan. GIS analyses were undertaken using DEM10B data of the Geospatial Information Authority of Japan (GSI) in the Niida, Furumichi, and Natsui River basins located in the Abukuma Mountains. Longitudinal profiles indicate many knick-zones along the three rivers at the edges of the low-relief surfaces defined as boundaries between gentle- and steep-slope areas. These knick-zones range from 300 m to 420 m in elevation and are situated in various geological settings. GIS analyses show the various elevations of ridge lines within each basin and the edges of low-relief surfaces operating as the local base levels of erosion in the Niida and Natsui River basins, which suggest different geomorphic formations in the cycle of erosion including a stage of uplifted peneplain.</p>

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• 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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Books 【 display / non-display 】

Books 【 display / non-display 】

• Geosites and Geodiversity of Ryukyu Islands

  Takayuki Ogata ( Part: Single Author )

  2022.12

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 】

• 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 

• 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 

• 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 【 display / non-display 】

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

  Project Year: 2014  -  2017 

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SDGs 【 display / non-display 】

Media Coverage 【 display / non-display 】

Media Coverage 【 display / non-display 】

• ジオ・ジャパン 絶景100の旅「奄美群島」  TV or radio program

  NHK  ジオ・ジャパン 絶景100の旅  2024.11

• ベトナム 変幻の大地〜ハロン湾と北部絶景地帯〜  TV or radio program

  NHK  グレートネイチャー  2024.7

• 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

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