Çok Kanallı Sismik ve Çok Işınlı Batimetrik Veriler Kullanılarak Orta Karadeniz Sırtı’na Yakın Sinop Havzası’nın Stratigrafik ve Yapısal özellikleri

Year 2024, Volume: 5 Issue: 2, 49 - 59, 31.12.2024

Sevinç Özel Füzün , Günay Çifçi , Hasan Sözbilir , Seda Okay Günaydın , Orhan Atgin , Özkan Özel

https://doi.org/10.53501/rteufemud.1469379

Abstract

Karadeniz'de son 100 yılda meydana gelen depremlerin odak mekanizması çözümleri, bölgede ağırlıklı olarak bindirme ve doğrultu atımlı fayların aktif olduğunu göstermektedir. Bu kümelerden biri de Sinop denizaltı havzasının bulunduğu Samsun açıklarında gelişiyor. Bu bölgedeki depremlerin sismik kaynaklarının araştırılması amacıyla yüksek çözünürlüklü çok kanallı sismik kesitler ve çok ışınlı batimetrik veriler işlenerek değerlendirilmiştir. En yaşlı sismik stratigrafik birimler (U4), dalgalı reflektörlü akustik temel olarak anılırken, üst kısmı uyumsuzluğu işaret eden yüksek genlikli yansımayla işaretlenmiştir. Bu tekdüzelik paralel veya daha az paralel olan birim 3 çökelleri tarafından örtülmektedir. Birim 2'nin üst yüzeyi, Birim 1'in paralel reflektörü tarafından örtülen aşınma yüzeyi ile işaretlenmiştir. Birim 1 en genç çökellerdir ve Yeşilırmak kanyonu tarafından kesilmektedir. Farklı yaşlarda üç fay belirlendi. Birim 4’ün sadece üst dokanağına ulaşabilen en eski fay, aktif olmayan fay olarak yorumlanmıştır. Sinop havzasını sınırlayan ve tüm sismik birimleri keserek deniz tabanına ulaşan faylar aktif fay sınıfında değerlendirilmektedir. Ancak Birim 1 içerisinde kalan ve deniz tabanına ulaşmayan faylar sedimantasyonla eş zamanlı faylar olarak değerlendirilmektedir. Bu verilere göre Orta/Doğu Pontid yapı bloğundaki faylanmaların bölgenin sismik aktivitesi bağlamında yeniden ele alınması ve gelecekte risk oluşturacak bir deprem tehlikesi olarak yeniden değerlendirilmesi gerekmektedir.

Keywords

Karadeniz, Sinop Çukuru, Çok Kanallı Sismik, Çok Işınlı Batimetrik Veriler, Aktif Tektonik

Stratigraphic and Structural Features of The Sinop Basin Close to The Mid Black Sea Ridge Using Multi-Channel Seismic and Multi-Beam Bathymetric Data

Abstract

Focal mechanism solutions of the earthquakes that occurred in the Black Sea in the last 100 years show that thrust and strike-slip faults are predominantly active in the region. One of these clusters is developing off the coast of Samsun where the submarine Sinop basin is located. In order to investigate the seismic sources of earthquakes in this area, high-resolution multi-channel seismic sections and multi-beam bathymetric data were processed and evaluated. The oldest seismic stratigrafic units (U4) is referred to as acoustic basement with wavy reflectors, while its top is marked by high amplitude reflection indicating an unconformity. This uniconformity is overlain by parallel or less parallel Unit 3 deposits. Upper surface of Unit 2 is marked by an erosional surface which is overlain by the parallel reflector of Unit 1. Unit 1 is the youngest sediments and truncated by Yeşilırmak canyon. Three fault types of different ages were determined. The oldest fault could reach only top of unit 4 has been interpreted as inactive fault. Faults that border the Sinop basin and reach the sea floor by cutting all seismic units are considered in the active fault class. However, the faults that remain within Unit 1 and do not reach the seafloor are considered as faults that are coeval with sedimentation. According to these data, faulting in the Central/Eastern Pontide structural block should be reconsidered in the context of the seismic activity of the region and re-evaluated as an earthquake hazard that will pose a risk in the future.

Keywords

Black Sea, Sinop Trough, Multi-Channel Seismic, Multi-Beam Bathymetric Data, Active Tectonics

Thanks

This study is a part of PhD thesis of Sevinç ÖZEL FÜZÜN. I would like to thank the members of the doctoral thesis monitoring committee Prof. Dr. Oya Pamukcu for their contributions. Special thanks must go to Dr. Özkan Cevdet ÖZDAĞ for their help using Promax and Kingdom program. The raw data in the article was collected within the scope of the Alert project. The processing of raw data was carried out on the computers of the SEIS laboratory affiliated with Dokuz Eylül University.

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