Seismogenic zones in Eastern Turkey

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Read Full Article (file size: 1456900 bytes) Cited by GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 24, 8039, doi:10.1029/2003GL018023, 2003 Seismogenic zones in Eastern Turkey Niyazi Turkelli Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Eric Sandvol Department of Geological Sciences, University of Missouri, Columbia, Missouri, USA Ekrem Zor Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Rengin Gok Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Tolga Bekler Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Ali Al-Lazki Institute for the Study of the Continents, Cornell University, Ithaca, New York, USA Hayrullah Karabulut Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Sadi Kuleli Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Tuna Eken Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Cemil Gurbuz Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey Salih Bayraktutan Earthquake Research Center, Ataturk University, Erzurum, Turkey Dogan Seber Institute for the Study of the Continents, Cornell University, Ithaca, New York, USA Muawia Barazangi Institute for the Study of the Continents, Cornell University, Ithaca, New York, USA Abstract A 29-station temporary broadband PASSCAL network was operated from late October 1999 to August 2001 in eastern Turkey in order to decipher the geodynamics of one of the youngest continent-continent collision zones in the world. This paper focuses on the hypocentral distribution of local earthquakes located during the operation of the network and provides new insights into the active faulting in the Anatolian plateau. A total of 1165 earthquakes were located and classified into four different categories based on the reliability of the locations as established by the data coverage. The accuracy of the locations ranked in the best two categories is estimated to be less than approximately 5 km. The results show that seismic activity in Eastern Turkey is higher than previously documented and there were no subcrustal earthquakes beneath the Arabian-Eurasian collision zone or beneath the Anatolian plateau during our deployment. This result suggests no or very little underthrusting of the Arabian plate beneath Eurasia. Our results also suggest that the North Anatolian Fault zone extends farther toward the southeast, well beyond the Karliova triple junction, and that a number of unmapped active, seismogenic faults exist in the region. We also observed a possible difference in the seismogenic thickness of the East Anatolian fault zone (EAFZ) and the North Anatolian fault zone (NAFZ). Received 22 June 2003; accepted 17 September 2003; published 28 October 2003. Index Terms: 7205 Seismology: Continental crust (1242); 7230 Seismology: Seismicity and seismotectonics; 8102 Tectonophysics: Continental contractional orogenic belts; 8107 Tectonophysics: Continental neotectonics; 8120 Tectonophysics: Dynamics of lithosphere and mantle—general. Read Full Article (file size: 1456900 bytes) Cited by Citation: Turkelli, N., et al. (2003), Seismogenic zones in Eastern Turkey, Geophys. Res. Lett., 30(24), 8039, doi:10.1029/2003GL018023. Copyright 2003 by the American Geophysical Union.

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