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Quaternary tectonics of the North Anatolian fault zone and its environs

Research Project

Project/Area Number 02680199
Research Category

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

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionThe University of Tokyo

Principal Investigator

IKEDA Yasutaka  Univ. Tokyo, Fac. of Sci. Lecturer, 理学部, 講師 (70134442)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsNorth Anatolian fault / active fault / satellite imagery / plate boundary / SPOT映像
Research Abstract

The westernmost portion of the North Anatolian fault zone (NAFZ) has been believed to be of transitional nature from the dominantly-transcurrent tectonic regime in the east to the extensional tectonic regime in western Turkey and the Aegean Sea. We analyzed late Quaternary surface deformation in and around this : portion of NAFZ, using SPOT and COSMOS imagery ; limited field observations were employed as ground truth. The following results were obtained :
1. Fault offsets on Pleistocene geomorphic surfaces are visible on satellite imagery, whereas those developed on Holocene surfaces are not. Active fault traces detected on the satellite imagery coincide almost exactly with the surface breaks associated with the 1944, 1957 and 1967 earthquakes.
2. NAFZ west of the Mudurnu Valley branches into two active fault zones : the lzmit-Sapanca Fault Zone on the north, and the lznik-Mekece fault on the south. The Iznik-Mekece fault is dominantly strike-slip and consists of a simple, continuous strand ; a considerable dipslip component exists on its western portion. In contrast, late Quaternary deformation in the lzmit-Sapanca Fault Zone is quite paradoxical. Our interpretation of satellite imagery and limited field observations indicate that Quaternary surface deformation in this fault zone is compressional, although fault plane solutions of microearthquakes (Evans et al., 1985) suggest that transtensional movements are presently dominant. We speculate that the geometry of faults at seismogenic depths (>6 km) is different from those at the surface.

Report

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

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Ikeda,Y.: "Geological evidence for the last two faulting events on the North Anatolian fault zone in the Mudurnu Valley,western Turkey" Tectonophysics. 193. 335-345 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tuncer,M.K.: "Magnetic anomalies related to active folds in the North Anatolian fault zone" J.Geomag.Geoelectr.43. 813-823 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ikeda,Y.: "Postglacial crustal deformation associated with slip on the western part of the North Anatolian fault zone in the Iznik Lake basin,Turkey" Bull.Dept.Geogr.,Univ.Tokyo. 23. 13-23 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ikeda, Y., Suzuki, Y., Herece, E., Saroglu, F., Isikara, A. M., and Honkura, Y.,: "Geological evidence for the last two faulting events on the North Anatolian fault zone in the Mudurnu Valley, western Turkey" Tectonophysics. 193. 335-345 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tuncer, M. K., Honkura, Y., Oshiman, N., Ikeda, Y., and Ishikara, A. M.: "Magnetic anomalies related to active folds in the North Anatolian fault zone" J. Geomag. Geoelectr.,. 43. 813-823 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ikeda, Y., Herece, E., Sugai, T., and Isikara, A. M.: "Postglacial crustal deformation associated with slip on the western part of the North Anatolian fault zone in the Iznik Lake basin, Turkey" Bull. Dept. Geogr., Univ. Tokyo. 23. 13-23 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ikeda,Y.: "Geological evidence for the last two faulting events on the North Anatolian fault zone in the Mudurnu Valley,western Turkey" Tectonophysics. 193. 335-345 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tuncer,M.K.: "Magnetic anomalies related to active folds in the North Anatolian fault zone" J.Geomag.Geoelectr.43. 813-823 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Ikeda,Y.: "Postglacial crustal deformation associated with slip on the western part of the North Anatolian fault zone in the Iznik Lake basin,Turkey" Bull.Dept.Geogr.,Univ.Tokyo. 23. 13-23 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Ikeda,Y.: "Geological evidence for the last two fanlting events on the North Anatolian fault in the Mudurnn valley,western Turkey" Tectonophysics.

    • Related Report
      1990 Annual Research Report

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

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