GÇ

Günay Çifçi

Dokuz Eylül University

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Derman Dondurur

Dokuz Eylül University

Seda Okay

Dokuz Eylül University

S. Gürçay

Dokuz Eylül University

M. S. Steckler

Columbia University

Christopher C. Sorlien

University of California, Santa Barbara

A.E. Aksu

Memorial University of Newfoundland

Louis Géli

Ifremer

O. Atgın

Dokuz Eylül University

H. Sarıtaş

Dokuz Eylül University

Hülya Kurt

Istanbul Technical University

Cooperative Institutions

Centre National de la Recherche Scientifique

Ifremer

Dokuz Eylül University

Istanbul Technical University

Lamont-Doherty Earth Observatory

Columbia University

Université de Bretagne Occidentale

Aix-Marseille Université

GEOMAR Helmholtz Centre for Ocean Research Kiel

Memorial University of Newfoundland

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Marine Geophysical Research (1997)

Günay Çifçi A.F. Limonov Lyubomir Dimitrov V. G. Gainanov

Mud volcano

Seafloor Spreading

Décollement

Doming

10.1023/a:1004319226273

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Citations (8)

Collaborative Research: The North Anatolian Fault System in the Marmara Sea, Turkey - Insights from the Quaternary evolution of a multi-stranded transform

EGU General Assembly Conference Abstracts (2015)

Seda Okay Christopher C. Sorlien Günay Çifçi Marie‐Hélène Cormier Derman Dondurur

North Anatolian Fault

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Gas and seismicity within the Istanbul seismic gap

Scientific Reports (2018)

Louis Géli Pierre Henry C. Grall Jean Baptiste Tary Anthony Lomax

Abstract Understanding micro-seismicity is a critical question for earthquake hazard assessment. Since the devastating earthquakes of Izmit and Duzce in 1999, the seismicity along the submerged section of North Anatolian Fault within the Sea of Marmara (comprising the “Istanbul seismic gap”) has been extensively studied in order to infer its mechanical behaviour (creeping vs locked). So far, the seismicity has been interpreted only in terms of being tectonic-driven, although the Main Marmara Fault (MMF) is known to strike across multiple hydrocarbon gas sources. Here, we show that a large number of the aftershocks that followed the M 5.1 earthquake of July, 25 th 2011 in the western Sea of Marmara, occurred within a zone of gas overpressuring in the 1.5–5 km depth range, from where pressurized gas is expected to migrate along the MMF, up to the surface sediment layers. Hence, gas-related processes should also be considered for a complete interpretation of the micro-seismicity (~M < 3) within the Istanbul offshore domain.

North Anatolian Fault

10.1038/s41598-018-23536-7

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Citations (26)

Modeling of the Foca-Uzunada magnetic anomaly and thermal structure in the gulf of Izmir, western Turkey

Journal of Asian Earth Sciences (2018)

Attila Aydemir Funda Bilim Günay Çifçi Seda Okay

Anomaly (physics)

10.1016/j.jseaes.2018.02.010

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Citations (13)

Steady-state Quaternary Basin Formation Along the North Anatolian Fault System in Marmara Sea, Turkey

AGUFM (2011)

Christopher C. Sorlien L. Seeber M. S. Steckler D. J. Shillington Hülya Kurt

North Anatolian Fault

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Sonar and High Resolution Seismic Studies in the Eastern Black Sea

TURKISH JOURNAL OF EARTH SCIENCES (2002)

Günay Çifçi Derman Dondurur Mustafa Ergün

The Black Sea is one of the largest inland seas in the world. Off the shelf, the water depth quickly plunges to an average depth of 2 km. The Black Sea sediments are rich in calcite and organic carbon, the latter showing a high degree of preservation due to anoxia in the waters below 100-150 m. Slope failures and sediment instability related to immense gas and gas hydrate accumulations are serious problems that can lead to the failure of offshore installations. Marine geophysical surveys have been carried out in the Eastern Black Sea basin using state-of the-art technology to produce sonar and high-resolution maps. A number of prominent structures were detected in the area such as slumping, sliding, pockmarks, faults and dome-like structures. In the Turkish near shore and the abyssal plain, shallow gas accumulations have been detected and are continuous about 25-65 m beneath the seafloor. The gas-bearing strata appear as bright spots and cloudy spots, sometimes pockmarks and acoustic blanking. The sediments on the Turkish shelf contain certain concentrations of gas which can seep to the seabed surface and generate pockmarks. Gas-hydrate layers in the sediments often appears as dark and strong reflection pockets on sub-bottom profiler records.

Slumping

Seabed

Clathrate hydrate

Seafloor Spreading

Abyssal plain

Petroleum seep

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Citations (20)

Investigaton of ÇINARCIK Basin and North Anatolian Fault Within the Sea of Marmara with Multichannel Seismic Reflection Data

EGU General Assembly Conference Abstracts (2012)

O. Atgın Günay Çifçi Christopher C. Sorlien L. Seeber M. S. Steckler

North Anatolian Fault

Reflection

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Basins beyond Bends along Continental Transforms in NW Turkey and Southern California: Rapid, Asymmetric, and Time-Transgressive Growth

AGU Fall Meeting Abstracts (2009)

L. Seeber D. J. Shillington Günay Çifçi Emin Demirbağ C. C. Sorlien

Transgressive

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Slip rate estimation along the western segment of the Main Marmara Fault over the last 405-490 ka by correlating mass transport deposits

Tectonics (2013)

C. Grall Pierre Henry Y. Thomas Graham K. Westbrook M. Namık Çağatay

[1] High-resolution 3-D seismic data acquired in the Sea of Marmara on the Western High, along the northwestern branch of the North Anatolian Fault (also known as the Main Marmara Fault), shed new light on the evolution of the deformation over the last 500–600 ka. Sedimentary sequences in ponded basins are correlated with glacioeustatic cycles and transitions between marine and low sea/lake environments in the Sea of Marmara. In the 3 × 11 km2 of the 3-D seismic survey, deformation over the last 405–490 ka is localized along the main fault branch and north of it, where N130°–N140° trending normal faults and N40°–N50° folding accommodated strike-slip deformation associated with active argillokinesis. There is some evidence that deformation was more distributed further back in the past, at least over the depth range (<600 m below seafloor) of our survey. A N110° basin and buried ridge system were eventually cut by the presently active fault. The southern part of the basin was then uplifted, while the northern part was folded but continued to subside along the fault. A mass transport deposits complex dated between 405–490 ka shows a lateral displacement of 7.7 ± 0.3 km, corresponding to an estimated slip rate of 15.1–19.7 mm/a. We conclude that this strand of the Main Marmara Fault on the Western High has taken up most of the strike slip motion between the Anatolian and Eurasian plates over the last 405 ka at least.

North Anatolian Fault

Seafloor Spreading

10.1002/2012tc003255

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Citations (42)

Tectonic activity and stratigraphic history over the last 130-540 ka on the Southern Shelf of the Sea of Marmara, western North Anatolian Fault, Turkey

AGU Fall Meeting Abstracts (2016)

Walter H. F. Smith C. Grall Christopher C. Sorlien M. S. Steckler Seda Okay

North Anatolian Fault

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