The East Anatolian Fault Zone: Seismotectonic setting and spatiotemporal characteristics of seismicity based on precise earthquake locations

Bulut, Fatih; Bohnhoff, Marco; Eken, Tuna; Janssen, C.; Kılıç, Tuğbay; Dresen, Georg

doi:10.1029/2011jb008966

Cited by 104 publications

(68 citation statements)

References 56 publications

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“…Current deformation is mainly accommodated through strain localization along the North Anatolian Fault (NAF) and the East Anatolian Fault (EAF). The deformation along the EAF is purely left lateral with no compressional component except for localized thrust ridges associated with strike-slip tectonics (Bulut et al, 2012). Body wave tomography images on global and regional scale indicate that the Hellenic subduction penetrates down to the lower mantle with an average dip of about 40 • (Wortel and Spakman, 2000;Faccenna et al, 2006;Biryol et al, 2011;Salaün et al, 2012) while a recent waveform tomography study by Fichtner et al (2013a, b) did not report any deep slab.…”

Section: Introductionmentioning

confidence: 85%

Thickness of the lithosphere beneath Turkey and surroundings from S-receiver functions

et al. 2015

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Abstract. We analyze S-receiver functions to investigate variations of lithospheric thickness below the entire region of Turkey and surrounding areas. The teleseismic data used here have been compiled combining all permanent seismic stations which are open to public access. We obtained almost 12 000 S-receiver function traces characterizing the seismic discontinuities between the Moho and the discontinuity at 410 km depth. Common-conversion-point stacks yield wellconstrained images of the Moho and of the lithosphereasthenosphere boundary (LAB). Results from previous studies suggesting shallow LAB depths between 80 and 100 km are confirmed in the entire region outside the subduction zones. We did not observe changes in LAB depths across the North and East Anatolian faults. To the east of Cyprus, we see indications of the Arabian LAB. The African plate is observed down to about 150 km depth subducting to the north and east between the Aegean and Cyprus with a tear at Cyprus. We also observed the discontinuity at 410 km depth and a negative discontinuity above the 410, which might indicate a zone of partial melt above this discontinuity.

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Section: Introductionmentioning

confidence: 85%

Thickness of the lithosphere beneath Turkey and surroundings from S-receiver functions

et al. 2015

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“…Similarly, Burton et al [1984] stated, based on analysis of the seismicity between 1900 and 1978, that the seismic activity of the EAF seemed surprisingly low and that it might be an area where seismic creep is dominant. In addition, Bulut et al [2012] recently found low seismicity rates along the eastern half of the EAF (38 ı E-41 ı E) for the time period 2007-2011. Periods of low seismic activity in this area have also been identified in the past 500 years, e.g., during the 250 years from 1544 to 1789 [Ambraseys, 1989].…”

Section: Discussionmentioning

confidence: 99%

Block‐like plate movements in eastern Anatolia observed by InSAR

Cavalié

Jónsson

2014

Geophysical Research Letters

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The question whether continental plates deform internally or move as rigid blocks has been debated for several decades. To further address this question, we use large‐scale interferometric synthetic aperture radar (InSAR) data sets to study how eastern Anatolia and its surrounding plates deform. We find that most of the deformation is focused at the North and East Anatolian faults and little intraplate deformation takes place. Anatolia is therefore moving, at least its eastern part, as a uniform block. We estimate the slip velocity and locking depth of the North Anatolian fault at this location to be 20 mm/yr and ~14 km, respectively. High deformation gradient found near the East Anatolian fault, on the other hand, suggests that little stress is accumulating along the eastern sections of that fault.

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“…The estimates of the accumulated overall offset along the EAF vary between an upper range of 27-33 km that is recorded by geological features and the length of the Gölbaşı strike-slip basin Bulut et al, 2012) and a lower range of 15-22 km that is defined by drainage channel offsets on individual fault segments (Hempton, 1987;Bulut et al, 2012). Studies based on the geologic and geomorphic data along the EAF provide slip rates of between 6 and 11 mm/year (Arpat and Şaroğlu, 1975;Kiratzi, 1993;Westaway, 1994;Yürür and Chorowicz, 1998;Çetin et al, 2003;Aksoy et al, 2007;Herece, 2008;Emre, 2013, Yönlü et al, 2013), whereas GPS studies provide a constant slip rate of ~10 mm/year along the whole EAF (Reilinger et al, 2006;Mahmoud et al, 2013;Aktuğ et al, 2016).…”

Section: Seismotectonic Settingmentioning

confidence: 99%