Kahramanmaraş Deprem dizisinin Erzurum ve çevresinde meydana getirdiği Kosismik Deformasyonlar ve bölgenin Sismik Parametre Analizi

Yıl 2025, Cilt: 10 Sayı: 3, 375 - 392, 24.08.2025

Halil İbrahim Solak , Cemil Gezgin , Ahmet Sami Kilinç , İbrahim Tiryakioğlu , Tamer Baybura , Kayhan Aladoğan , Ece Bengünaz Çakanşimşek

https://doi.org/10.29128/geomatik.1652700

Öz

Bu çalışmada, 2023 Kahramanmaraş depremleri (Mw:7.7 Pazarcık ve Mw:7.6 Ekinözü) sonrası Kuzeydoğu Anadolu Fay Zonu üzerinde bulunan Erzurum ve çevresindeki kosismik yer değiştirmelerin hesaplanması amacıyla 22.FENBIL.30 no’lu proje kapsamında kurulan 17 noktalı GNSS ağı kullanılmıştır. Ağda yer alan noktalarda 2022 ve 2023 yıllarında gerçekleştirilen GNSS ölçümlerinden elde edilen koordinatlar, bölgede yer alan TUSAGA-Aktif istasyonları ve TUTGA-99A noktalarının intersismik ve postsismik hızları kullanılarak deprem epoğuna taşınmıştır. Elde edilen sonuçlar Kahramanmaraş depremleri kaynaklı kosismik yer değiştirmelerin Erzurum civarında vektörel olarak 2.5 mm ile 30 mm arasında olduğunu ve bölgede GB yönlü bir atımın meydana geldiğini göstermektedir. Bu sonuçlar, sol yanal atım karakterine sahip fayların ürettiği bu yıkıcı depremlerin dış merkezleri ve odak mekanizma çözümleri ile literatürde gerçekleştirilen geniş ölçekli çalışmalarla uyum içerisindedir. Ayrıca, Erzurum ve çevresindeki mevcut sismik tehlikeyi değerlendirmek amacıyla 1900-2024 yılları arasını kapsayan KRDAE deprem kataloğu kullanılarak hesaplanan a ve b parametreleri, 3 ayrı alt bölgeye ayrılan alanda bulunan faylarda farklı aktivite ve gerilim birikim düzeyleri olduğunu göstermiştir. Hesaplamalar sonucunda a parametresi, Erzurum’un B-KB’sındaki bölgede yüksek (a=5.29), diğer bölgelerde ise orta seviyede sismik aktiviteyi işaret etmektedir. b parametresi ise Erzurum’un batısında küçük depremlerin daha sık olduğunu (b=0.90), doğusunu kapsayan bölgede büyük depremlerin daha fazla olabileceğini (b=0.69), güneyinde ise daha dengeli bir tehlike profili olduğunu ortaya koymuştur (b=0.76). Elde edilen sonuçlar, bölgenin sismik aktivitesiyle uyumlu olup, bölgedeki heterojen tektonik yapıların büyük deprem potansiyeli taşıdığını göstermektedir. Bu bulgular, bölgedeki gelecekteki deprem tehlike analizleri için önemli bir temel oluşturmaktadır.

Anahtar Kelimeler

GNSS, kosismik Deformasyon, Kahramanmaraş Depremleri, Kuzeydoğu Anadolu Fay Zonu (KDFZ), Tektonik, Sismik Parametreler

Teşekkür

Bu çalışma “Erzurum Civarındaki Fayların Kinematiğinin Jeodezik Ölçülerle Belirlenmesi” isimli 22.FEN.BİL.30 numaralı AKÜ-BAP projesi tarafından desteklenmektedir. GNSS ağında yer alan noktalara ilişkin veri teminin sağlanmasında çalışmayı destekleyen Tapu Kadastro Genel Müdürlüğü ve Harita Genel Müdürlüğü’ne teşekkür ederiz

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