İzmit Körfezi manyetik verilerine kenar tespit yöntemlerinin uygulanması

Yıl 2024, , 300 - 312, 15.03.2024

Gülten Aktaş , Ahmet Sinan Demirel

https://doi.org/10.17714/gumusfenbil.1380078

Öz

Marmara Denizi’nin kuzeydoğusunda yer alan İzmit Körfezi Kuzey Anadolu Fayı’nın kuzey kolu üzerinde olması nedeniyle sismik tehlike tahminleri açısından oldukça önemli etkilere sahiptir. Bu çalışmada İzmit Körfezi’nin yapısal çizgisellikleri yüksek çözünürlüklü manyetik veriler kullanılarak tanımlanmıştır. Başlangıçta verilere günlük düzeltme işlemi yapılmış ve gürültü etkilerini ortadan kaldırılmak amacıyla filtreler uygulanmıştır. Ayrıca, İzmit Körfezi’nin çizgiselliklerini ve yapısal unsurların sınırlarını çıkarmak için verilere birinci düşey türev, analitik sinyal, Tilt açısı, yatay gradyanın tilt açısı (TAHG), softsign fonksiyonu (SF) yöntemleri uygulanmıştır. Manyetik anomalilere neden olan yapısal unsurların belirlenmesinde TAHG ve SF filtreleri keskin ve net kenarlar oluşturmuştur. Tespit edilen çizgiselliklerin ana eğilimi körfezde D-B ve KD-GB yönündedir. Bu çalışmadan elde edilen bulgular sismik yansıma kesitleriyle de değerlendirilerek kesitlerdeki faylar ile çizgiselliklerin oldukça uyumlu oldukları görülmüştür. Böylece İzmit Körfezi’nin tektonik ve yapısal çerçevesinin daha iyi anlaşılması açısından manyetik sonuçlar güvenilir bir yapısal harita sunmaktadır. Çalışmadan elde edilen bölgenin çizgisellik haritası gelecekte yapılacak yeni araştırmalara katkı sağlayacağı açıktır.

Anahtar Kelimeler

İzmit Körfezi, Manyetik, Softsign fonksiyonu, TAHG, Tilt açısı

Etik Beyan

Bu makalenin yazarları, bu çalışmada kullanılan materyal ve yöntemlerin etik kurul izni ve / veya yasal-özel izin gerektirmediğini beyan etmektedir.

Destekleyen Kurum

İstanbul Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü

Proje Numarası

48218

Teşekkür

Bu çalışma, İstanbul Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü tarafından 48218 numaralı proje ile desteklenmiştir. Değerli yorumları için Prof. Dr. Z. Mümtaz HİSARLI’ ya teşekkür ederiz. Makalenin inceleme ve değerlendirme aşamasında yapmış oldukları katkılardan dolayı editör ve hakemlere teşekkür ederiz.

Application of edge detection methods to İzmit Gulf magnetic data

Öz

The Gulf of İzmit, which is in the northeast of the Marmara Sea, has significant implications for seismic hazard predictions due to its location on the northern branch of the North Anatolian Fault. The structural lineaments of the Gulf of Izmit were defined using high-resolution magnetic data. Initially, the data were corrected diurnal correction and filters were applied to remove noise effects. In addition, first vertical derivative, analytical signal, tilt angle, tilt angle of horizontal gradient (TAHG), softsign function (SF) filter methods were applied to the data to extract the lineaments of İzmit Gulf, and the boundaries of structural elements. TAHG and SF filters produced sharp and clear edges in the identification of structural elements causing magnetic anomalies. The main trend of the obtained lineaments is in the E-W and NE-SW directions in the gulf. The findings obtained from this study were also evaluated with seismic reflection sections and it was observed that the faults and lineaments in the sections were quite compatible. Thus, magnetic results provide a reliable structural map for a better understanding of the tectonic and structural framework of the İzmit Gulf. Thus, it is clear that the linearity map of the region obtained from the study will contribute to new research to be carried out in the future.

Anahtar Kelimeler

İzmit Gulf, Magnetic, Softsign function, TAGH, Tilt angle

Proje Numarası

48218

Kaynakça

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