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26 Eylül 2019 günü Türkiye yerel saati 13.59’da Silivri açıklarında (Marmara Denizi) Kuzey Anadolu Fay hattı Kumburgaz segmenti üzerinde 6.99 km derinlikte büyüklüğü Mw 5.8 olan deprem meydana gelmiştir. Deprem Tekirdağ ve İstanbul başta olmak üzere Yalova, Kocaeli, Bursa ve Kırklareli illerinde hissedilmiştir. 26 Eylül Silivri depremi, 1999 Kocaeli (Mw 7.6) ve 1999 Düzce (Mw 7.1) depremleri ve artçılarından sonra bölgeyi etkileyen en büyük deprem olması nedeni ile önemlidir. Bu çalışma kapsamında Mw 5.8 Silivri deprem yer hareketi kayıtları incelenmiştir. Yer hareketi parametresi Maksimum Yer İvmesi (PGA), 2014 Yeni Nesil Yer Hareketi Tahmin denklemleri (YHTD - Next Generation Attenuation -NGA- Relations) kullanılarak değerlendirilmiştir. Ayrıca yer hareketi parametreleri (MMI, PGA, Sa 0.2 s, Sa 1.0 s) dağılım haritaları oluşturularak, kaydedilmiş yer hareketleri ile karşılaştırılmıştır. Ayrıca öncü ve artçı depremler değerlendirilerek orta ölçekli Marmara Denizi depremlerinin karakteristiği ortaya konmuştur. Ortaya çıkan enerji miktarı geçmiş büyük ölçekli depremler ile karşılaştırılmıştır.
On September 26, 2019, a earthquake occurred at 13.59 a.m. local time in Turkey at Silivri (Marmara Sea) on the northern Anadolu Fay line on the Kumburgaz segment at a depth of 6.99 km, with a magnitude of MW 5.8. The earthquake was felt mainly in Yalova, Kocaeli, Bursa and Kırklareli, including Tekirdağ and Istanbul. The 26th September Silivri earthquake, 1999 Kocaeli (Mw 7.6) and 1999 Düzce (Mw 7.1) were the biggest earthquake that affected the region after the earthquake and the earthquake. In the framework of this study, the MW 5.8 Silivri earthquake ground movement records were studied. The Earth Movement Parameters were evaluated using the 2014 New Generation Earth Movement Forecast Equations (YHTD - Next Generation Attenuation -NGA- Relations). Also the ground movement parameters (MMI, PGA, Sa 0.2 s, Sa 1.0 s) are compared to recorded ground movements by creating distribution maps. Furthermore, prior and increasing earthquakes have been evaluated and highlighted the characteristics of medium-scale Marmara Sea earthquakes. The amount of energy that occurred was compared to the previous massive earthquakes.
On September 26, 2019 at 13:59 Turkish local time, on the Kumburgaz segment of the North Anatolian fault-line, an offshore event, Silivri (Marmara Sea) Earthquake with a magnitude of Mw 5.8 at the depth of 6.99 km occurred. The earthquake was felt especially in the nearby cities Tekirdag and Istanbul, and other cities Yalova, Kocaeli, Bursa and Kırklareli in the region, as well. The September 26 Silivri earthquake is important because, it is the biggest earthquake affecting the region after 1999 Kocaeli (Mw 7.6) and 1999 Duzce (Mw 7.1) earthquakes and their aftershocks. In this study, Mw 5.8 Silivri earthquake ground motion records were examined. The ground motion parameter, Peak Ground Acceleration (PGA), was evaluated using the 2014 Next Generation Attenuation Relations (Ground Motion Prediction Equations (GMPEs). In addition, distribution maps of ground motion parameters (MMI, PGA, Sa 0.2 s, Sa 1.0 s) were generated and compared with the recorded ground motions. The amount of energy released during the earthquake has been compared with the past large-scale earthquakes.
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