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

Denizhan Vardar (), Hakan Alp, Sinan Demirel, Hande Aykurt Vardar and Bedri Alpar
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Denizhan Vardar: İstanbul University
Hakan Alp: İstanbul University-Cerrahpaşa
Sinan Demirel: İstanbul University
Hande Aykurt Vardar: İstanbul University-Cerrahpaşa
Bedri Alpar: İstanbul University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 107, issue 2, No 41, 1905-1923

Abstract: 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.

Keywords: Ganos fault; North-Anatolian fault; Sea of Marmara; High-resolution marine seismic reflection data; Marine magnetic; Tectonic (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-021-04664-2

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