ARTALAN SİSMİK GÜRÜLTÜ VERİLERİNDEN ELDE EDİLEN GREEN FONKSİYONLARININ GEÇERLİLİĞİNİN ADANA HAVZASINDAKİ ANDIRIN DEPREMİ İLE DOĞRULANMASI

Abstract

İki istasyon arasındaki Green fonksiyonlarının elde edilmesinde Adana Havzasında (Güneydoğu Türkiye), Boğaziçi Üniversitesi, Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü (KRDAE) ve Türkiye Afet ve Acil Durum Yönetimi Başkanlığı Deprem Araştırma Dairesi (DAD) tarafından işletilen ulusal sismolojik ağlarda toplanan düşey bileşen sürekli veriler kullanılmıştır. Artalan Sismik Gürültü (ASG) verileri 1’er saatlik dilimler halinde kesilip, veri aktarımındaki kopmalar nedeniyle oluşan boşluklar tarandıktan sonra, verilere trend giderme, ortalama alma, cihaz tepkisinin giderilmesi, 10 sps örnekleme ve 50s alçak geçişli süzgeç ön işlemleri uygulanmıştır. Ardından 1 saatlik çapraz ilişki fonksiyonlarının hesaplanması ve yığmaları ile iki istasyon arasındaki Green fonksiyonları elde edilmiştir. Green fonksiyonlarını doğrulamak için 22.07.2012 tarihinde Andırın (ANDN) istasyonunun yakınında meydana gelen 5.0 (Ml) büyüklüğündeki Andırın depremi kullanılmıştır. ANDN istasyonunu sanal kaynak olarak kullanarak, KARA, KMRS, KIZK, MERS ve YAYL istasyonları ile ANDN istasyonu arasında elde edilen Green fonksiyonları ile gerçek deprem sismogramları ile karşılaştırılmıştır. Deprem sismogramları ve hesaplanan Green fonksiyonları arasındaki uyum, Rayleigh dalgası grup hızlarının, ASG verilerinden bu bölge için güvenilir bir şekilde belirlenebileceğini göstermektedir.

Keywords

• Artalan Sismik Gürültü
• Green Fonksiyonları
• Yüzey Dalgası

Project Number

No. 1929B011200045 (TÜBITAK-2218).

VALIDATION OF THE GREEN’S FUNCTIONS RETRIEVED FROM AMBIENT NOISE BY ANDIRIN EARTHQUAKE IN THE ADANA BASIN

Abstract

The vertical component continuous data recorded by the national seismological networks (Kandilli Observatory and Earthquake Research Institute (KOERI) of Bosporus University and Earthquake Research Department (ERD) of Disaster and Emergency Management Presidency of Turkey) in the Adana Basin (Southeastern Turkey) are used to retrieve the Green’s functions between two stations. The noise data were cut into 1-hour segments, scanned for the gaps caused by transmission drop-outs, preprocessed by removing the trend, mean and instrument response, down sampled to 10sps and low-pass filtered at 50s. Then the hourly cross-correlations are computed and stacked and the Green’s functions between two stations are retrieved. To validate the retrieved Green’s functions, the Andirin earthquake of magnitude 5 occurred on 22.07.2012 near the station Andirin (ANDN) is used. By using the ANDN station as the virtual source, the Green’s functions at KARA, KMRS, KIZK, MERS and YAYL stations are compared with the real earthquake seismograms. The agreement between the earthquake seismograms and the retrieved Green’s functions suggests that the Rayleigh wave group velocities can reliably be estimated for the region by using ambient noise data.

Keywords

• Ambient Noise
• Green’s Function
• Surface Wave

Supporting Institution

TUBITAK

Project Number

No. 1929B011200045 (TÜBITAK-2218).

Thanks

I am sincerely grateful to my advisors H. Argun Kocaoglu and Ayse Kaslilar Sisman for their continuous supports, scientific guidance, patience, motivation, enthusiasm.

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