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Regional differences of the crustal movements and the duration of the more active tectonics during the Holocene time in the Ryukyu Islands

Research Project

Project/Area Number 02452297
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionUniversity of the Ryukyus

Principal Investigator

KAWANA Toshio  University of the Ryukyus College of Education Associate Professor, 教育学部, 助教授 (60044955)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1990: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsRyukyu Islands / Holocene tectonics / Coral reefs / Tsunami deposits / C-14 dates / Holocene sea-level changes / Submarine earthquakes / Philippine Sea plate / 地震隆起
Research Abstract

Ryukyu Islands are an island arc, situated between Kyushu and Taiwan. The Philippine Sea plate has subducted under the Eurasia plate at the Ryukyu Trench, and the Okinawa Trough has rifted in the Quaternary period ; the Ryukyu Islands have been stressed by the subduction of the Philippine Sea plate and the expansion of the Okinawa Trough. Consequently, the Ryukyu Islands have demonstrated the active island arc in the Holocene time. On the other hand, the Ryukyu Islands are surrounded by coral reefs so that the emerged Holocene reefs are dated by using of the C-14 method for unaltered aragonitic fossil corals. In addition, tsunami deposits which consist of Holocene corals can be dated by the same method. These tsunami deposits have been transported to the Ryukyu Islands probably due to submarine earthquakes. Following islands are selected to investigate in this study : Amami, Toku, Okinoerabu, Okinawa, Iheya, Izena, Tokashiki, Zamami, Aka, Kume, Tonaki, Miyako, Tarama and Yaeyama Islands. On the basis of coastal geomorphology of limestone shores and many dates of fossil corals in these islands, the following results may be summarized.
1. The eustatic sea-level fall occurred 4200 and 3000 years BP.
2. Holocene tsunamis generated off the South Ryukyus about 220, 500, 1000, 2000, 2400, 3800 and 4400 years BP. probably caused by submarine earthquakes in the Submarine Deep-Sea Terrace between the Ryukyu Trench and the South Ryukyus.
3. The more active tectonics in the Holocene period may have occurred about 1700-2400 years BP. due to the intensive activity of the Philippine Sea plate.
4. Regional differences of the Holocene tectonics in the Ryukyu Islands are due to the interaction between the subduction of the Philippine Sea plate and expansion of the Okinawa Trough.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Kawana,T.et al.: "Recent through Pleistocene coral reefs in the Ryukyu Islands" Proceedings of the 29th International Geogogical Congress. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河名 俊男,大出 茂: "沖大東島の第四紀地殻変動" 地理学評論.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河名 俊男,中田 高: "南琉球弧周辺海域の津波特性" 地理学評論.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河名 俊男(分担執筆): "『熱い自然サンゴ礁の環境誌』(サンゴ礁地域研究グル-プ編)「離水サンゴ礁を特徴づけるノッチ」(分担執筆)" 古今書院, 372(66-82) (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 河名 俊男(分担執筆): "『沖縄の自然一地形と地質』(氏家宏編)「隆起した現世サンゴ礁を追う」(分担執筆)" ひるぎ社, 271(69-86) (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kawana, T.: "Quaternary crustal movements in the Ryukyu Islands" Gekkan Chikyu (Earth Monthly). 11. 618-630 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kawana, T.: "Re-examination on the Holocene emerged shorelines in Irabu and Shimoji Islands, the South Ryukyus, Japan" Daiyonki-Kenkyu (Quaternary Research). 28. 419-426 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kawana, T.: "Recent through Pleistocene coral reefs in the Ryukyu Islands (C-35 Field Trip)" Proceedings of the 29th International Geological Congress. Kyoto. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kawana, T.: "Holocene tsunamis off the South Ryukyu Islands" Geographical review of Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kawana, T.: "Quaternary crustal movements in Oki-Daito Island" Chigaku-Zasshi (Journal of Geography).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Coral Reef Areas Research Group (ed.): Kokon shoin. Hot nature : coral reef environments, 372 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ujiie, H. (ed.): Hirugi-sha. Nature of Okinawa : geomorphology and geology, 271 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hujita, K. (eds.): Tokyo University Press. Active faults in Japan : distribution maps and data, 437 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kawana,T.et al.: "Recent through Pleistocene coral reefs in the Ryukyu Islands(in contribution)" Proceedings of the 29th International Geogogical Congress. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 河名 俊男,大出 茂: "沖大東島の第四紀地殻変動" 地理学評論.

    • Related Report
      1991 Annual Research Report
  • [Publications] 河名 俊男,中田 高: "南琉球弧周辺海域の津波特性" 地理学評論.

    • Related Report
      1991 Annual Research Report
  • [Publications] 河名 俊男(分担執筆): "『熱い自然サンゴ礁の環境誌』(サンゴ礁地域研究グル-プ編) 「離水サンゴ礁を特徴づけるノッチ」(分担執筆)" 古今書院, (372)66-82 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 河名 俊男(分担執筆): "『沖縄の英然ー地形と地質』(氏家 宏編) 「隆起した現世サンゴ礁を追う」(分担執筆)" ひるぎ社, (271)69-86 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 河名 俊男: "Reーexamination on the Holocene emrged shorelines in Irabu and Shimoji Islands,the South Ryukyus,Japan" 第四紀研究. 28. 419-426 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 河名 俊男: "南琉球弧周辺海域の津波特性と周辺域の完新世地殻変動" 地理学評論.

    • Related Report
      1990 Annual Research Report
  • [Publications] 河名 俊男: "沖大東島(隆起準卓礁)の第四紀地殻変動に関する一考察" 地学雑誌.

    • Related Report
      1990 Annual Research Report
  • [Publications] サンゴ礁地域研究グル-プ: "熱い自然 サンゴ礁の環境誌" 古今書院, 372 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 氏家 宏: "沖縄の自然ー地形と地質" ひるぎ社, 271 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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