Pliocene–Quaternary tectonic evolution of the Gulf of Gökova, southwest Turkey

Tur, Hüseyin; Yaltırak, Cenk; Elitez, İrem; Sarıkavak, Kerim

doi:10.1016/j.tecto.2014.11.008

Cited by 55 publications

(30 citation statements)

References 88 publications

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“…for northern and central Greece relative to Eurasia (Nyst and Thatcher, 2004;Reilinger et al, 2006) indicated on map (this map is taken from Wallace et al, (2008) Bathymetry extracted from the CGMW/UNESCO Morpho-Bathymetry of the Mediterranean Sea (Brossolo et al, 2012). Faults are compiled from (Yaltırak, 2002;Elitez and Yaltırak, 2014;Mascle and Martin, (1990);Papanikolaou et al, (2002); Yaltırak et al, (2012); Tur et al, 2015;Ocakoğlu et al, 2004;Sözbilir et al, 2009;Sözbilir et al, 2008Sözbilir et al, ,2009Sözbilir et al, ,2011Sözbilir et al, ,2017Eytemiz and Erdeniz Özel, 2020;Emre et al, 2018Emre et al, , Özkaymak et al, 2013. respectively.…”

Section: Resultsmentioning

confidence: 99%

Present day strike-slip deformation within the southern part of the İzmir-Balıkesir Transfer Zone based on GNSS data and implications for seismic hazard assessment in western Anatolia

EYÜBAGİL¹,

Solak²,

Kavak³

et al. 2021

Turkish J Earth Sci

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Here, we present a combined analysis of GNSS-derived strain rate maps in accordance with recent seismicity to reveal that the N-S extension is accommodated primarily by strike-slip faulting of the İzmir Balıkesir Transfer Zone (İBTZ) where a counter clockwise rotation (approx. 25-100º/Myr) along vertical axis is dominant. Our results indicate that strike-slip segments within the İBTZ show variable transport sense and amount of slip along them and they connect by hard linkage relay ramps with the dip to oblique slip normal faults. According to the strain map, Karaburun Peninsula has the largest strain rates of 137 ns/yr extension (NE-SW) and 126 ns/yr (NW-SE) compression. To the south the largest strain areas begin to shrink where the NW-trending sinistral Riedel fault is located. The smallest strains in the region are measured on the NEtrending Tuzla Fault compatible with right lateral component. Based on this, the northern part of the Karaburun Peninsula has the shortest recurrence period in the 3 region. The geodetic earthquake recurrence periods throughout the region as 800 yr for magnitudes 7 and above and 70 yr for magnitudes between 6 and 7. The period was calculated 30 years for M>5.5 (with 99% probability) and 100 years for M> 6 (with 95% probability). These are in consistent with geodetic earthquake recurrence periods (25-30 years for M> 5.5 and 80-100 years for M> 6). This result shows that the seismic hazard sources in the region have increased the earthquake risk that may caused loss of life and property in near future.

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Section: Resultsmentioning

confidence: 99%

Present day strike-slip deformation within the southern part of the İzmir-Balıkesir Transfer Zone based on GNSS data and implications for seismic hazard assessment in western Anatolia

EYÜBAGİL¹,

Solak²,

Kavak³

et al. 2021

Turkish J Earth Sci

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“…Geomorphological indicators such as drowned valleys, a sinuous coastline, a scarcity of beaches ( Figure 8) and the presence of tilted deltaic sequences in offshore sediments all suggest subsidence of the coast of Turkey between 28 • E and 31 • E during the late Quaternary (Figure 8; e.g. Flemming, 1978;Hall et al, 2009;Anzidei et al, 2011;Kızıldag et al, 2012;Özdaş and Kızıldag, 2013;Yildiz et al, 2013;Aksu et al, 2014;Tur et al, 2015).…”

Section: Geomorphological and Archaeological Evidence Of Subsidence Imentioning

confidence: 99%

Subduction and vertical coastal motions in the eastern Mediterranean

Howell¹,

Jackson²,

Copley³

et al. 2017

Geophysical Journal International

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S U M M A R YConvergence in the eastern Mediterranean of oceanic Nubia with Anatolia and the Aegean is complex and poorly understood. Large volumes of sediment obscure the shallow structure of the subduction zone, and since much of the convergence is accommodated aseismically, there are limited earthquake data to constrain its kinematics. We present new source models for recent earthquakes, combining these with field observations, published GPS velocities and reflection-seismic data to investigate faulting in three areas: the Florence Rise, SW Turkey and the Pliny and Strabo Trenches. The depths and locations of earthquakes reveal the geometry of the subducting Nubian plate NE of the Florence Rise, a bathymetric high that is probably formed by deformation of sediment at the surface projection of the Anatolia-Nubia subduction interface. In SW Turkey, the presence of a strike-slip shear zone has often been inferred despite an absence of strike-slip earthquakes. We show that the GPS-derived strain-rate field is consistent with extension on the orthogonal systems of normal faults observed in the region and that strike-slip faulting is not required to explain observed GPS velocities. Further SW, the Pliny and Strabo Trenches are also often interpreted as strike-slip shear zones, but almost all nearby earthquakes have either reverse-faulting or normal-faulting focal mechanisms. Oblique convergence across the trenches may be accommodated either by a partitioned system of strike-slip and reverse faults or by oblique slip on the Aegean-Nubia subduction interface. The observed late-Quaternary vertical motions of coastlines close to the subduction zone are influenced by the interplay between: (1) thickening of the material overriding the subduction interface associated with convergence, which promotes coastal uplift; and (2) subsidence due to extension and associated crustal thinning. Long-wavelength gravity data suggest that some of the observed topographic contrasts in the eastern Mediterranean are supported by mantle convection. However, whether the convection is time dependent and whether its pattern moves relative to Nubia are uncertain, and its contribution to present-day rates of vertical coastal motions is therefore hard to constrain. The observed extension of the overriding material in the subduction system is probably partly related to buoyancy forces arising from topographic contrasts between the Aegean, Anatolia and the Mediterranean seafloor, but the reasons for regional variations are less clear.

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“…A study, performed in Italy, indicated +4m eustatic sea-level change during the Holocene for the Mediterranean region (Lambeck et al, 2004a). The Holocene relative sealevel fluctuation shows regional differences that result from (Şenel, 2002;Tur et al, 2015;simplified from Özsayın, 2016). C) Geological map of the Datça Peninsula showing location of the old and modern Cnidus (Dirik, 2007;Ersoy 1991).…”

Section: Records Of Sea-level Changes In the Mediterranean Regionmentioning

confidence: 99%

Late Quaternary subsidence records from the Datça graben and Cnidus ancient city (SW Turkey): sea-level changes versus tectonics

Özsayın

Üner

Kahraman

2021

GeA

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The Datça graben in southwestern Anatolia is a WNW-trending seismically active depression, with tectonic activity since Pliocene time. This tectonic activity is controlled by normal faults, which have effected ancient settlements. The Cnidus city (old and modern) –an ancient mercantile centre during the Hellenistic, Roman and Byzantine periods– is one of the places that has recorded this activity. The ancient harbour walls of Cnidus, lying 2.2-4.0m below sea level, contain important traces about sea-level changes and tectonics over the past 2.6kyr. Palaeostress analysis along boundary faults in the Datça graben yields an almost N–S oriented pure tensional regime, compatible with earthquake focal mechanism solutions located around the Datça Peninsula. Additionally, an almost E−W trending surface rupture related to a historical earthquake in modern Cnidus, which shows normal fault characteristics, gives further support to the ongoing extension along the Kızlan, Karaköy and Cnidus fault zones. Previous studies on late Quaternary sea-level changes around the Datça Peninsula suggest that 2.6kyr ago sea level was 1.0-1.25m lower than today. From the present-day depth of the Old Cnidus harbour remains and regional sea-level records, it can be inferred that tectonics has played a significant role. Our calculations show that the Datça graben is subsiding at rates of 0.36-0.46mm/yr in the central part and 1.05-1.15mm/yr in the southern part. These values match those found in other areas around the Datça Peninsula.

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Pliocene–Quaternary tectonic evolution of the Gulf of Gökova, southwest Turkey

Cited by 55 publications

References 88 publications

Present day strike-slip deformation within the southern part of the İzmir-Balıkesir Transfer Zone based on GNSS data and implications for seismic hazard assessment in western Anatolia

Present day strike-slip deformation within the southern part of the İzmir-Balıkesir Transfer Zone based on GNSS data and implications for seismic hazard assessment in western Anatolia

Subduction and vertical coastal motions in the eastern Mediterranean

Late Quaternary subsidence records from the Datça graben and Cnidus ancient city (SW Turkey): sea-level changes versus tectonics

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