Caner İMREN, Emin DEMİRBAĞ, A. M. Celal ŞENGÖR

Kuzey Anadolu Fayı' nın Marmara Denizi içindeki devamı

Marmara Denizi'nde toplanmış olan 2200 km'lik çok-kanallı sismik yansıma hatlarının değerlendirilmesi esnasında, kuzey çukurluklarım örten çok ışınlı derinlik verisinden faydalanılmıştır. Çok-kanallı sismik yansıma verileri İTÜ Jeofizik Mühendisliği Bölümü Nezihi Canıtez Veri İşlem Laboratuvar 'ında Disco-Focus yazılım paketi ile işlenmiştir. Marmara Denizi'nin kuzey kesiminin şu anda sürekli faal doğrultu-atımlı bir fay sistemi ile kesildiği sonucuna ulaşılmıştır ve bu fay, Marmara Fayı olarak adlandırılmıştır. Marmara Fayı, Marmara Denizi doğusundaki 270°'lik İzmit Fayı'nı, denizin batısındaki 245°'lik Ganos Fayı 'na bağlar. Marmara Fayı iki ana doğrultuya sahiptir. Fay, Marmara Denizi 'nin 2/3 'lük batı kısmında 130 km uzunluğunda ve 265 °yönünde uzanırken, doğu kısmında ise 70 km'nin üzerinde 295° doğrultusunda uzanmaktadır.

The continuation of the North Anatolian Fault within the Sea of Marmara

We analyze 2200 km of multi-channel seismic reflection profiles that have become recently available in the Sea of Marmara. This analysis benefits from the recent acquisition of multi-beam bathymetric data covering the axial portion of the northern basins. We conclude that the northern Sea of Marmara is at present cut by an active continuous strike-slip fault system, that we call the Marmara Fault. It links the 270° İzmit portion of the northern branch of the North Anatolian Fault to the east of the sea to the 245° Ganos Fault to the west. The Marmara Fault which is the continuation of the Ganos Fault in the Sea of Marmara with the 265 ° extent and approximately 130 km length is followed as a fault offset the Tekirdağ Basin, Western High, Central Basin and Central High. At the northeastern extremity of the Sea of Marmara, it turns southeast toward the northern margin of the Çınarcık Basin. It extends about 70 km in a 295° direction in the Çınarcık Basin. There is thus a 25° clockwise rotation with respect to the 270° İzmit Fault strand that should result in a slight extensional component. Certainly when it is called Marmara Fault, it should be considered the Marmara Fault Zone (MFZ) at the same time. The corridor that followed by microearthquake activity in the Sea of Marmara is the seismological evidence that also support the Marmara Fault Zone term.

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