Shear wave velocity structure of the Anatolian Plate: anomalously slow crust in southwestern Turkey

Delph, Jonathan R.; Biryol, C. B.; Beck, S. L.; Zandt, G.; Ward, Kevin M.

doi:10.1093/gji/ggv141

Cited by 69 publications

(89 citation statements)

References 70 publications

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“…The upper-mantle structure of Eastern Anatolia has been imaged in various body and surface wave tomography experiments (Al-Lazki et al, 2003;Gök et al, 2003;Lei and Zhao, 2007;Toksöz et al, 2010;Biryol et al, 2011;Salaün et al, 2012;Koulakov, 2011;Fichtner et al, 2013;Delph et al, 2015). The lithosphere in Eastern Anatolia is underlain by a lowvelocity zone (Pn velocity = 7.6-7.9 km/s), and this has been interpreted as anomalously hot asthenosphere in the uppermost mantle (Toksöz et al, 2010;Biryol et al, 2011;Salaün et al, 2012;Koulakov, 2011;Fichtner et al, 2013;Delph et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The lithosphere in Eastern Anatolia is underlain by a lowvelocity zone (Pn velocity = 7.6-7.9 km/s), and this has been interpreted as anomalously hot asthenosphere in the uppermost mantle (Toksöz et al, 2010;Biryol et al, 2011;Salaün et al, 2012;Koulakov, 2011;Fichtner et al, 2013;Delph et al, 2015). The hot asthenospheric flow in the upper mantle might have affected the crustal and lithospheric structure in Eastern Anatolia (e.g., Keskin, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…The hot asthenospheric flow in the upper mantle might have affected the crustal and lithospheric structure in Eastern Anatolia (e.g., Keskin, 2003). The presence of low-velocity structures within the lower crust might be attributed to the low-velocity zone in the uppermost mantle (e. g., Pamukçu and Akçığ, 2011;Warren et al, 2013;Delph et al, 2015). The presence of widespread Miocene to Pleistocene volcanism across the region and the existence of hot asthenospheric material in the upper mantle suggest that delamination and slab break-off might have occurred in the late Miocene (Al-Lazki et al, 2003;Gök et al, 2003;Keskin, 2003;Şengör et al, 2003;Faccenna et al, 2006;Lei and Zhao, 2007;Göğüş and Pysklywec, 2008;Toksöz et al, 2010;Biryol et al, 2011;Koulakov, 2011;Fichtner et al, 2013;Bartol and Govers, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Lithospheric structure and the isostatic state of Eastern Anatolia: Insight from gravity data modelling

2018

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Eastern Anatolia, Turkey, is a part of the Alpine-Himalayan collisional belt where continental crust is relatively thin for a collisional belt. The region contains part of the Zagros suture zone, which formed during collision of the Arabian and Anatolian plates in the Miocene. It is underlain by a low-velocity zone associated with asthenospheric flow in the uppermost mantle.We constructed gravity models of the crust and upper-mantle structures to assess the driving mechanism of asthenospheric flow and the isostatic state of Eastern Anatolia. Our density models are based on terrestrial and satellite-derived gravity data, and they are constrained by receiver function and seismic tomography. The gravity models show significant lithospheric thickness variations across the Anatolian and Arabian plates. The lithospheric mantle in Eastern Anatolia is thinner (~62-74 km) than the Arabian plate (~84-95 km), indicating that part of the Anatolian mantle lithosphere might have been removed by delamination. The lithospheric removal process might have occurred following the detachment of the Arabian slab in the Miocene. Widespread Holocene volcanism and high heat flow in Eastern Anatolia can be considered as evidence of lithospheric delamination and slab break-off. The upward asthenospheric flow and subsequent asthenospheric underplating beneath Eastern Anatolia might have been induced by both delamination and slab break-off. These two processes may account for the rapid uplift of the Anatolian Plateau. There is a residual topography of ~1.7 km that cannot be explained by crustal roots. Based on our gravity models, we suggest that part of the eastern Anatolian Plateau is dynamically supported by asthenospheric flow in the upper mantle.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lithospheric structure and the isostatic state of Eastern Anatolia: Insight from gravity data modelling

2018

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“…The crustal structures of eastern Turkey were studied by numerous authors using different geophysical methods in addition to the ETSE project (Mindevalli and Mitchell, 1989;Hearn and Ni, 1994;Çınar, 1998;Maggi and Priestly, 2005;Barazangi et al, 2006;Gans et al, 2009;Mutlu and Karabulut, 2011;Ateş et al, 2012;Bakırcı et al, 2012;Vanacore et al, 2013;Tezel et al, 2013;Toker, 2014;Komut, 2014;Skobeltsyn et al, 2014;Çınar and Alkan, 2015;Delph et al, 2015a;Türkoğlu et al, 2015). Hearn and Ni (1994) obtained a Pn velocity distribution for most of the Turkish-Iranian Plateau of as low as 7.9 km/s.…”

Section: Introductionmentioning

confidence: 99%

Crustal S-wave structure around the Lake Van region (eastern Turkey) from interstation Rayleigh wave phase velocity analyses

Çınar¹,

Alkan²

2017

Turkish J Earth Sci

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IntroductionAfter two more devastating earthquakes, occurring on 23 October 2011 (M w = 7.2) and on 9 November 2011 (M w = 5.6), that hit the city of Van (eastern Turkey) and its surroundings, this region has received the special interest of geophysicists and geologists. Owing to the continental collision between the Arabian and Eurasian Plates in eastern Turkey, this region is a remarkable natural laboratory for earth scientists. The Eastern Turkey Seismic Experiment (ETSE) project was performed by Sandvol et al. (2003b) using the earthquake data of 29 V-shaped broadband PASSCAL stations in this region. Data recorded via these stations of this project have been used and processed by many authors with different methods (

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“…The bulk of this ring in the south is the Hellenic subduction trench (Giunchi et al 1996). This subduction arc is a result of the African and Aegean plates converging at a rate of~33 mm/yr (Delph et al, 2015). The African plate is moving slowly relative to Eurasia in a northward direction along the Hellenic trench (Jackson 1994).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Crustal Strain in Turkey from Continuous GNSS Measurements in the Interval 2009–2017

Ansari

Corumluoǧlu

Sharma

2017

Journal of Geodetic Science

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Abstract:The present study investigates the crustal strain in Turkey by using data from the Turkish permanent GNSS network (TPGN) and international GNSS services (IGS) observations for a period of 9 years, 2009 t0 2017. The positional variation of GNSS sites is studied to understand the coordinate reliability, interseismic and coseismic e ects and linear velocities as well as three dimensional principal strains across the country. The study of coordinate reliability shows that the horizontal and vertical residuals in 2013 and 2015 are of the order of 100 mm per coordinate or higher than those of 2009 and 2011 and 10 times higher than those of 2017. The changes in baseline length relative to an arbitrary zero-o set for the selected period shows that the most of the sites have displacement in the interval − to 10 mm but some sites have larger variations. These displacements are mostly related to motion of the Turkish tectonic plate, regional crustal deformation and small amounts of errors in GNSS positioning. The most GNSS site velocities located all over Turkey give signicant information for the study. The GNSS data shows that the Anatolian plate relative to the Eurasia is moving in a western direction in the central part of Turkey and starts to move in a south-westerly direction in the west part of the country. The westward motion of Anatolia increases gradually from 20 mm/yr in central Anatolia to 30 mm/yr in south-west Turkey. The numerical simulation of the crustal strain in the Aegean region shows a maximum 1.0446×10 − compressional principal strain rate while the second principal strain rate is zero. The strain in Central Anatolia is evidently dominated by extensional deformations and the principal strain rate reaches to 0.9589×10 − with maximum extension. The Marmara Region network is subject to an extensional principal strain (0.6608×10 − )which is also revealed in the Mediterranean Region with a 0.5682×10 − extension. The present analysis of GNSS data over the region may complement towards the understanding of the stability of regional tectonics and long term aseismic strain inside the country.

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Shear wave velocity structure of the Anatolian Plate: anomalously slow crust in southwestern Turkey

Cited by 69 publications

References 70 publications

Lithospheric structure and the isostatic state of Eastern Anatolia: Insight from gravity data modelling

Lithospheric structure and the isostatic state of Eastern Anatolia: Insight from gravity data modelling

Crustal S-wave structure around the Lake Van region (eastern Turkey) from interstation Rayleigh wave phase velocity analyses

Numerical Simulation of Crustal Strain in Turkey from Continuous GNSS Measurements in the Interval 2009–2017

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