Active faults and evolving strike-slip basins in the Marmara Sea, northwest Turkey: A multichannel seismic reflection study

A. I. Okay*, A. Kaşlilar-Özcan, C. Imren, A. Boztepe-Güney, E. Demirbag, I. Kuşçu

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

235 Atıf (Scopus)


The North Anatolian Fault is a 1200-km-long transform fault forming the boundary between the Anatolian and Eurasian plates. Near its western end it strikes through the Marmara Sea, and is responsible for the creation of three deep marine depressions. The North Anatolian Fault system and the linked basins in the eastern Marmara Sea were studied using newly acquired multi-channel seismic reflection data. In the Marmara Sea the North Anatolian Fault consists of a main strand and a few subsidiary branches. The main strand is made up of the Ganos (15 km long), Central Marmara (105 km) and North Boundary (45 km) fault segments. The North Boundary Fault joins in the east to the Izmit segment, which was ruptured during the M(S) 7.4 earthquake on 17.8.1999. The North Boundary Fault is highly oblique to the regional displacement vector, which results in the generation of a symmetrical fault-wedge basin. This Cinarcik Basin is a wedge-shaped deep marine depression south of Istanbul. It is about 50 km long, up to 20 km wide and 1250 m deep, and is filled with Pliocene to Quaternary sediments, over 3 km thick. The North Boundary Fault joins in the west to the transpressional Central Marmara Fault. Around the restraining segment boundary the syntransform sediments are being deformed into a large anticlinorium. The Cinarcik Basin started to form when the westward-propagating North Anatolian Fault intersected a northwest-trending pre-existing fault zone during the Pliocene and bifurcated into NW- and SW-trending segments, forming a transform-transform-transform-type triple junction. Dextral strike-slip movement along the arms of the triple junction led to the development of the Cinarcik Basin. The present fault geometry in the Marmara region was achieved later during the mid-Pliocene following the termination of the triple junction geometry. South of the main North Anatolian Fault system there is a second active strike-slip fault in the Marmara Sea made up of several segments. A highly asymmetrical fault-bend basin, comprising Pliocene-Quaternary sediments over 2.5 km thick, is forming along a releasing fault segment of this South Boundary Fault system. (C) 2000 Elsevier Science B.V. All rights reserved.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)189-218
Sayfa sayısı30
Basın numarası2
Yayın durumuYayınlandı - 30 May 2000


This study forms part of the National Marine Geology and Geophysics Programme (coordinator Naci Görür) supported by TÜBITAK grants YDABÇAG 198Y077 and 199Y079. We thank the Turkish Petroleum Company (TPAO) for access to the seismic sections in the Marmara region. Muzaffer Siyako is also thanked for inspiring discussions on the North Anatolian Fault. Nilgün Okay and Okan Tüysüz, and the journal referees H.-G. Kahle and Y. Mart provided helpful comments on the manuscript.

FinansörlerFinansör numarası
National Marine Geology and Geophysics Programme
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu199Y079, YDABÇAG 198Y077

    Parmak izi

    Active faults and evolving strike-slip basins in the Marmara Sea, northwest Turkey: A multichannel seismic reflection study' araştırma başlıklarına git. Birlikte benzersiz bir parmak izi oluştururlar.

    Alıntı Yap