• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Nascent plate boundary along the eastern margin of the Japan Sea: testing a new hypothesis by geomorphological methods

Research Project

Project/Area Number 60580198
Research Category

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

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionDepartment of Geography, Faculty of Science, University of Tokyo

Principal Investigator

IKEDA Yasutaka  Research Associate, Dept. Geography, Univ. Tokyo, 理学部, 助手 (70134442)

Co-Investigator(Kenkyū-buntansha) YONEKURA Nobuyuki  Associate Professor, Dept. Geography, Univ. Tokyo, 理学部地理学教室, 助教授 (30011563)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
KeywordsNascent plate boundary / Central Japan / Tectonic geomorphology / Net slip / 中部日本
Research Abstract

Kobayashi (1983) and Nakamura (1983) presented a new hypothesis that the boundary between the North American and Eurasian plates has jumped from Central Hokkaido to the eastern margin of the Japan Sea in the recent geologic past. In order to test this hypothesis quantitatively, we determined rate Quaternary rates of slip on major fault zones in Central Japan, where the landward extension of this nascent plate boundary is believed to pass. We revealed that the rates of slip on the Itoigawa-Shizuoka Tectonic Line and the Ina Valley Fault Zone (IVFZ) are as large as 8 mm/yr or more. Although data on slip rates on other faults are not sufficient, the total convergence rate of Central Japan seems larger than that (c.a. 11 mm/yr) predicted by the new hypothesis. We also determined the direction of slip on the IVFZ by a new geomorphological method that we developed; this slip direction (N123+10 deg E), again, is discordant with the east-west convergence direction predicted by the new hypothesis. Thus, we tentatively interpret that the deformation in the middle and southern part of Central Japan is much affected by the collision of the Izu arc, although the possibility of the nascent boundary is not ruled out. Further data on late Quaternary rates of net slip on active faults in the northern part of Central Japan are required for testing this hypothesis.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Ikeda,Y;Yonekura,N.: Bulletin of the Department of Geography,University of Tokyo. 18. 49-63 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 阿部一,池田安隆: 地理学評論.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Ikeda, Y. and Yonekura, N.: "Determination of late Quaternary rates of net slip on two major fault zones in Central Japan" Bulletin of the Department of Geography, University of Tokyo. 18. 49-63 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Abe, H. and Ikeda, Y.: "Rates of net slip on active faults in the northern Ina Basin (in Japanese)" Geographical Review of Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

URL: 

Published: 1987-03-31   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi