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


Vardar D. , Alp H., Demirel A. S. , Aykurt Vardar H., Alpar B.

Natural Hazards, cilt.107, ss.1905-1923, 2021 (SCI İndekslerine Giren Dergi)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 107
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1007/s11069-021-04664-2
  • Dergi Adı: Natural Hazards
  • Sayfa Sayıları: ss.1905-1923

Özet

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