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Earthquake history of the Gökova fault zone by paleoseismologic trenching, SW Turkey

Author

Listed:
  • Aynur Dikbaş

    (İstanbul University-Cerrahpaşa)

  • H. Serdar Akyüz

    (İstanbul Technical University)

  • Mehran Basmenji

    (İstanbul Technical University)

  • Erdem Kırkan

    (İstanbul Technical University)

Abstract

The Gulf of Gökova is a half-graben that is located on the southernmost part of the Aegean Extensional Region. The gulf is bounded on its north by the Gökova Fault Zone, which is an active fault zone that is composed of normal fault segments. We performed paleoseismological trenching throughout the fault zone at two sites, Keramos and Gereme sites. We have recognized two paleoearthquake horizons in Gereme trench and one paleoearthquake horizon in Keramos trench. Dating of samples by OSL and radiocarbon dating methods, and outcomes of Bayesian calculation in Oxcal, bracket the age of the older paleoevent as BCE 1099-161 and the younger event as CE 961-1574. Depending on the age bracket and written accounts in historical catalogues we compare the older paleoevent to the BCE 412-411 historical earthquake and the younger event to the CE 1493 historical earthquake. In conclusion, from this study, we have evidence for at least two surface faulting earthquakes during the Holocene, the most recent one representing the latest onshore surface rupturing event on the Gökova Fault Zone. Furthermore, depending on moment magnitude and rupture length relationships we suggest that the younger paleoearthquake event was about M = 7 according to a possible ~ 60-km-long surface rupture in at least between Kos island and Ören village.

Suggested Citation

  • Aynur Dikbaş & H. Serdar Akyüz & Mehran Basmenji & Erdem Kırkan, 2022. "Earthquake history of the Gökova fault zone by paleoseismologic trenching, SW Turkey," 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. 112(3), pages 2695-2716, July.
    • Handle: RePEc:spr:nathaz:v:112:y:2022:i:3:d:10.1007_s11069-022-05284-0
    DOI: 10.1007/s11069-022-05284-0
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    Cited by:

    1. Erdem Kırkan & Hüsnü Serdar Akyüz & Mehran Basmenji & Aynur Dikbaş & Cengiz Zabcı & Müge Yazıcı & Mehmet Korhan Erturaç, 2023. "Earthquake history of the Milas Fault: an active dextral fault in an extensional province (SW Anatolia, Türkiye)," 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. 116(2), pages 1639-1662, March.

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