Evidence for active faulting in the eastern part of the Gulf of Saros, northern Aegean, from high-resolution seismic data
- 81 Downloads
This study focuses on the determination of the near-surface tectonic features in the eastern part of the Gulf of Saros, a highly active seismic region within the North Anatolian Fault Zone. Approximately 350-km-line high-resolution seismic data were acquired to understand the active tectonic setting of the inner side of the gulf. The Ganos Fault, which generated the 9 August 1912 earthquake (Mw = 7.3) in western Turkey, enters into the Gulf of Saros from the east, cuts the southern margin of the gulf forming a trough which becomes broader and deeper westward. The seismic data reveal that the fault is not made up of a single segment or a pair of border faults bounding the trough. According to the seismic images of the fault segments, however, the emanating earthquake energy will possibly be carried by two different faults; namely the Ganos and Saros segments. These fault segments will be presented first in this paper in detail from new collected seismic data at the inner part of the gulf, and will be used to help a new tectonic model that explains how the Ganos segment controls the northern margin of the trough while the Saros segment controls the central part of the main trough. The latter is responsible from the development of an active basin and it forms the sudden deepening observed on the trough.
KeywordsGulf of Saros high-resolution seismic CHIRP seismic ganos fault saros fault
This work was supported by the Scientific Research Projects Coordination Unit of Istanbul University, project numbers YADOP-51794 and BEK-2017-24925. The author also appreciates the help that Sinan Demirel and Özkan Çamurcu gave during marine data acquisition, and the contributions of Bedri Alpar and Hakan Alp to data interpretation.
- Altınok Y, Alpar B, Yaltırak C, Kıyak N G and Zabcı C 2013 Tsunami effects on the eastern coast of Saros Bay, Turkey; In: Proceedings of the 40th CIESM Congress, Marseille, pp. 40–42.Google Scholar
- Amante C and Eakins B W 2009 ETOPO1 1 arc-minute global relief model: Procedures, data sources and analysis; NOAA Technical Memorandum NESDIS NGDC-24, National Geophysical Data Center, NOAA, https://doi.org/10.7289/V5C8276M.
- Armijo R, Pondard N, Meyer B, Uçarkuş G, Mercier de Lépinay B, Malavieille J, Dominguez S, Gustcher M, Schmidt S, Beck C, Çağatay N, Çakır Z, İmren C, Eriş K, Natalin B, Özalaybey S, Tolun L, Lefèvre I, Seeber L, Gasperini L, Rangin C, Emre O and Sarıkavak K 2005 Submarine fault scarps in the Sea of Marmara pull-apart (North Anatolian Fault): Implications for seismic hazard in Istanbul; Geochem. Geophys. Geosys. 6 1–29.CrossRefGoogle Scholar
- Gökaşan E, Tur H, Ergin M, Görüm T, Batuk F G, Sağci N, Ustaömer T, Emem O and Alp H 2010 Late Quaternary evolution of the Çanakkale Strait region (Dardanelles, NW Turkey): Implications of a major erosional event for the postglacial Mediterranean–Marmara Sea connection; Geo-Mar. Lett. 30 113–131.Google Scholar
- Gutzwiller O 1923 Beitrage zur Geologie der Umgebung von Merfete (Mürefte) am Marmara Meer; PhD Thesis, Universität Basel, Basel, 347p.Google Scholar
- Karabulut H, Roumelioti Z, Benetatos C, Mutlu A K, Özalaybey S, Aktar M, and Kiratzi A 2006 A source study of the 6 July 2003 (Mw 5.7) earthquake sequence in the Gulf of Saros (Northern Aegean Sea): Seismological evidence for the western continuation of the Ganos fault; Tectonophys. 412(3–4) 195–216.Google Scholar
- Sakinç M, Yaltirak C and Oktay F Y 1999 Palaeogeographical evolution of the Thrace Neogene Basin and the Tethys–Paratethys relations at northwestern Turkey (Thrace); Palaeogeogr. Palaeoclimatol. Palaeoecol. 153 17–40.Google Scholar
- Saner S 1985 Sedimentary sequences and tectonic setting of Saros Gulf region NE Aegean Sea, Turkey; Bull. Geol. Soc. Turkey 28 1–10.Google Scholar
- Sümengen M, Terlemez I, Şentürk K, Karaköse C, Erkan E, Ünay E, Gürbüz M and Atalay Z 1987 Stratigraphy, sedimentology, and tectonics of the Tertiary sequences in Gelibolu Peninsula and southwestern Thrace; Bulletin of the Mineral Research and Exploration Institute of Turkey Technical Report 8128 (in Turkish), 260p.Google Scholar
- Varotsos P A, Sarlis N and Skordas E S 2011 Entropy in natural time; In: Natural time analysis: The new view of time Springer Praxis Books. Springer, Berlin, Heidelberg, pp. 159–187.Google Scholar
- Yaltırak C 1996 Ganos Fay Sisteminin tektonik tarihi; TPJD Bult. (in Turkish) 8 137–156Google Scholar