EGU21-784, updated on 08 Jan 2024
https://doi.org/10.5194/egusphere-egu21-784
EGU General Assembly 2021
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Active subaquatic fault segments in Lake Iznik along the middle strand of the North Anatolian Fault, NW Turkey

Renaldo Gastineau1,2, Julia De Sigoyer1, Pierre Sabatier2, Stefano C. Fabbri3, Flavio S. Anselmetti3, Anne-Lise Develle2, Mustafa Şahin4, Serkan Gündüz4, Frank Niessen5, and A. Catalina Gebhardt5
Renaldo Gastineau et al.
  • 1Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France (renaldo.gastineau@univ-grenoble-alpes.fr)
  • 2EDYTEM, Université Savoie Mont-Blanc, Université Grenoble Alpes, CNRS, Le Bourget du Lac, France
  • 3Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland
  • 4Bursa Uludağ Üniversitesi, Fen-Edebiyat Fakültesi, Arkeoloji Bölümü, Görükle, Bursa, Turkey
  • 5Alfred Wegener Institute (AWI) Helmholtz Centre for Polar and Marine Research, D-27568, Bremerhaven, Germany

Lake Iznik (NW Turkey), is bordered by the middle strand of the North Anatolian Fault (MNAF), whose seismic activity is debated because of its quiescence during the instrumental period. In contrast, significant historical activity is documented by several chronicles over the last two millennia.

This study aims to get a new insight into its long-term seismicity and its tectonic setting. Lacustrine sediment cores reveal fourteen earthquake-induced turbidites since their ages correspond to seismic events during the past two millennia. Bathymetry and high-resolution seismic reflection data allow describing two hitherto unknown subaquatic active fault structures (the South Boyalica and Iznik faults), belonging to the MNAF system. Sediment cores sampled on both sides of the Iznik Fault document an event deposit and a sedimentary unit vertically offset of ∼ 40 cm interpreted as the last rupture during the 1065 CE destructive earthquake. Older events are supposed on this fault more than a thousand years ago. Further studies will help to estimate the horizontal coseismic offset of this oblique-slip fault and the calendar of older ruptures. The current seismic gap of thousand years on this segment greatly increases the seismic hazard in this region and must be considered in the seismic risk assessment of the NAF system.

How to cite: Gastineau, R., De Sigoyer, J., Sabatier, P., Fabbri, S. C., Anselmetti, F. S., Develle, A.-L., Şahin, M., Gündüz, S., Niessen, F., and Gebhardt, A. C.: Active subaquatic fault segments in Lake Iznik along the middle strand of the North Anatolian Fault, NW Turkey, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-784, https://doi.org/10.5194/egusphere-egu21-784, 2021.

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