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Offshore/onshore correlation of the North-Anatolian fault deformations in the Western Sea of Marmara

Author

Listed:
  • Denizhan Vardar

    (İstanbul University)

  • Hakan Alp

    (İstanbul University-Cerrahpaşa)

  • Sinan Demirel

    (İstanbul University)

  • Hande Aykurt Vardar

    (İstanbul University-Cerrahpaşa)

  • Bedri Alpar

    (İstanbul University)

Abstract

Newly collected high-resolution seismic reflection and magnetic data collected offshore of the Ganos Fault (NW Turkey) in the western Sea of Marmara, along the submerged portion of the North-Anatolian Fault, highlight the presence of a complex fault pattern. Based on these data, we propose a new tectonic model for this key region, connecting the onshore fault pattern to the transtensional basins of the deepest Sea of Marmara. According to this new model, three main faults control the deformation pattern of this region, fault SF1, a tectonic element that shapes the Tekirdağ Basin, and fault SF2, which although not affecting the sea floor, is structurally related to SF1. Another fault we called SF3, connects the offshore to the Ganos fault onshore creating a transtensional pattern nearby the shelf. All such kinematic indicators witness an incipient activity, and a seismogenic potential that should be determined by a detailed mapping of both the surficial expression of fault at the seafloor, and the deformation pattern observed in the post-glacial sedimentary sequence. The active fault pattern detected nearby the coastal areas and their structural relationships with the Tekirdağ basin show that it could be interpreted as a negative flower structure, which accommodates strain partitioning. This observation is crucial to seismic hazard assessments in this region that has been the site of destructive earthquakes in the recent and remote past.

Suggested Citation

  • Denizhan Vardar & Hakan Alp & Sinan Demirel & Hande Aykurt Vardar & Bedri Alpar, 2021. "Offshore/onshore correlation of the North-Anatolian fault deformations in the Western Sea of Marmara," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 107(2), pages 1905-1923, June.
    • Handle: RePEc:spr:nathaz:v:107:y:2021:i:2:d:10.1007_s11069-021-04664-2
    DOI: 10.1007/s11069-021-04664-2
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    References listed on IDEAS

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    1. Murat Utkucu & Zakir Kanbur & Ömer Alptekin & Fatih Sünbül, 2009. "Seismic behaviour of the North Anatolian Fault beneath the Sea of Marmara (NW Turkey): implications for earthquake recurrence times and future seismic hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 50(1), pages 45-71, July.
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