GNSS Tabanlı Jeodezik Gözlemlerle 6 Şubat 2023 Kahramanmaraş Depremlerinin Hasan Dağı Volkanı ve Çevresindeki Kosismik Etkilerinin Belirlenmesi

Öz

6 Şubat 2023 Kahramanmaraş deprem dizisinin (Mw 7.7 ve Mw 7.6) oluşturduğu kosismik deformasyonlar, Anadolu Plakası genelinde geniş ölçekte gözlenmiştir. Bu çalışma, söz konusu depremlerin Hasan Dağı Volkanı ve çevresinde kurulan GNSS ağı üzerindeki etkilerini incelemektedir. Çalışma kapsamında 3 sabit GNSS istasyonu (HAS1, HAS2, HAS3) ve 10 kampanya tipi noktadan oluşan bir mikro-jeodezik ağ kullanılmıştır. Deprem anındaki anlık yer değiştirmeler VADASE sistemi ile tespit edilmiş; 1 ve 30 sn’lik veriler ise kinematik PPP (PRIDE PPP-AR) ve statik (GAMIT/GLOBK) yöntemlerle analiz edilmiştir. Elde edilen sonuçlara göre, Pazarcık depremi sabit GNSS istasyonlarında doğu yönünde yaklaşık 22 mm, kuzey yönünde 4 mm kosismik deformasyona neden olurken, Ekinözü depremi daha küçük ancak belirgin yer değiştirmeler üretmiştir. Kampanya tipi noktalar için epok kaydırma yöntemiyle hesaplanan sonuçlar, ağ genelinde tutarlı kosismik deformasyonların varlığını ortaya koymaktadır. Elde edilen bulgular, büyük magnitüdlü depremlerin aktif volkanik sistemlerde ölçülebilir kosismik deformasyonlar üretebildiğini ve bu etkilerin GNSS ile yüksek zaman çözünürlüklü VADASE analizleri sayesinde güvenilir biçimde izlenebildiğini ortaya koymaktadır. Bu yaklaşım, aktif volkanların deprem kaynaklı tetikleyici süreçlerinin anlaşılması ve çok disiplinli izleme–risk yönetimi stratejilerinin geliştirilmesi açısından önemli bir katkı sunmaktadır.

Anahtar Kelimeler

• GNSS
• Kosismik deformasyon
• Hasan Dağı Volkanı
• Kahramanmaraş depremleri
• VADASE

Determination of the Coseismic Effects of the February 6, 2023 Kahramanmaraş Earthquakes on the Mount Hasan Volcano Using GNSS-Based Geodetic Observations

Öz

The coseismic deformations caused by the February 6, 2023 Kahramanmaraş earthquake sequence (Mw 7.7 and Mw 7.6) were observed over a wide area across the Anatolian Plate. This study investigates the effects of these earthquakes on a GNSS network established around Mount Hasan volcano. A micro-geodetic network consisting of three continuous GNSS stations (HAS1, HAS2, HAS3) and ten campaign-style sites was used. Temporary coseismic displacements were detected using the VADASE system, while the data were analyzed through kinematic PPP (PRIDE PPP-AR) and static processing (GAMIT/GLOBK). Results indicate that the Pazarcık earthquake caused coseismic displacements of approximately 22 mm eastward and 4 mm northward at the continuous stations, whereas the Ekinözü earthquake produced smaller but distinct displacements. Epoch-shifting analyses of campaign sites reveal consistent coseismic deformation patterns across the network. The results show that large earthquakes can produce measurable co-seismic deformation in active volcanic systems, detectable through high-resolution GNSS VADASE analysis, contributing to improved monitoring and hazard assessment.

Anahtar Kelimeler

• GNSS
• Coseismic deformation
• Mount Hasan Volcano
• Kahramanmaraş doublets
• VADASE

Kaynakça

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