Marmara Bölgesinde Ampirik Green Fonksiyon Yöntemiyle Deprem Benzeşimlerinin Elde Edilmes

Aydın  Mert; Yasin  Fahjan; Ali  Pınar; Lawrence  Hutchıngs

doi:10.17824/huyuamd.43325

Stratigraphic Ranges of the Benthic Foraminifera and Microfacies of the Upper Maastrichtian-Paleocene Shallow Marine Carbonate Successions in the Eastern Pontides (Ne Turkey)

Yıl 2014, Cilt: 35 Sayı: 1, 141 - 168, 01.02.2014

Aydın Mert Yasin Fahjan Ali Pınar Lawrence Hutchıngs

https://doi.org/10.17824/huyuamd.43325

Öz

The main purpose of this article is to simulate three mid-sized earthquakes that occurred in Marmara Sea region, which has complex geologic and tectonic characteristics resulting in heterogeneous crustal structure. In the calculation of earthquake simulations, the method based on empirical Green’s function (EGF) developed by Hutchings and Wu (1990) is used. In this way, we evaluate the achievements in simulating ground motion waveforms using empirical Green’s function method especially for Marmara region where complex geologic structure exists. The main assumption of the method that simple rupture models and small sized earthquakes (impulsive point source event) recorded in the region can be used as an empirical Green’s functions to simulate earthquake ground motions. Accurate estimation of strong motion time history simulation is essential to establishing the recent technology of the earthquake-resistant design and performance based design of structure to reduce earthquake damage. The main reason of this, non-linear dynamic analysis of structures in time domain needs synthetic accelerograms as an input. We simulate three earthquakes (Mw≈5) that occurred along three different extensions of the North Anatolian Fault Zone (NAFZ) inside of the Marmara Sea. The first one occurred on the northern branch of the NAFZ, in northern part of the Marmara Sea, the second one was along the mid-branch of NAFZ that bissects the Gulf of Gemlik and the last one took place on the southern branch of NAFZ in the vicinity of Kus Lake south of the terrestrial areas of the Marmara Sea. Earthquakes used in the study were recorded by broadband seismometer network operated by Kandilli Observatory and Earthquake Research Institute (KOERI). Modelling was made for each earthquake using by five stations, each of which recorded at least one after shock and one main shock, in total ten stations. The distance between recording stations and earthquake hypocenters ranged from 17 km to 121 km. The distance between the simulated earthquake hypocenter and EGF hypocenter ranged from 0.73km to 1.64 km. Similarities between recorded and simulated waveforms were investigated in terms of different parameters such as first arrivals of P waves, time differences between S and P wave arrivals, recording duration, maximum ground velocity, Fourier spectrum and energy distribution. The results confirm that empirical Green’s function method is an appropriate method to obtain ground motion simulations especially in areas such as Marmara region which has a heterogeneous crust structure

Anahtar Kelimeler

Empirical Green’s function, earthquake simulation, marmara region

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Marmara Bölgesinde Ampirik Green Fonksiyon Yöntemiyle Deprem Benzeşimlerinin Elde Edilmes

Yıl 2014, Cilt: 35 Sayı: 1, 141 - 168, 01.02.2014

Aydın Mert Yasin Fahjan Ali Pınar Lawrence Hutchıngs

https://doi.org/10.17824/huyuamd.43325

Öz

Bu makalenin temel amacı, jeolojik ve tektonik olarak karmaşık özellikler gösteren dolayısıyla oldukça heterojen bir kabuk yapısına sahip Marmara bölgesinde meydana gelmiş üç adet orta büyüklükte depremin benzeşimini elde etmektir. Deprem benzeşimlerinin hesaplanmasında Hutchings ve Wu (1990) tarafından geliştirilen Ampirik Green Fonksiyon (AGF) tabanlı bir yöntem kullanılmıştır. Bu sayede, AGF yönteminin özellikle Marmara bölgesi gibi karmaşık jeolojik özellikler gösteren bir bölgede yer hareketi dalga formlarının modellenmesindeki başarısı değerlendirilmiştir. Kullanılan yöntem, basit yırtılma modelleri ve bölgede kaydedilmiş küçük depremleri ani etkili nokta kaynak kabulüyle ampirik Green fonksiyonlar olarak kullanarak, deprem yer hareketi benzeşimlerinin elde edilebileceği esasına dayanır. Depreme dayanıklı yapı tasarımında performansa dayalı tasarım yaklaşımının benimsenmesi ile birlikte, kuvvetli yer hareketinin benzeşiminin elde edilmesi konusu önem kazanmıştır. Bunun en önemli sebebi, zaman ortamında doğrusal olmayan dinamik analizlerde girdi olarak kullanılan sentetik akselerogramlara duyulan gereksinimdir. Benzeşimi elde edilen üç depremde (Mw≈5) Kuzey Anadolu Fay Zonunun (KAFZ) Marmara Denizi içindeki farklı uzantıları boyunca oluşmuştur. Bunlardan ilki KAFZ’nun Marmara denizinin kuzeyinden geçen kolu üzerinde, diğeri Gemlik Körfezini kesen orta kol, sonuncusu ise Kuş Gölü civarında KAFZ’nun Marmara denizinin güneyindeki karasal alanlardan geçen güney kolu üzerinde meydana gelmiştir. Çalışmada kullanılan depremler Kandilli Rasathanesi ve Deprem Araştırma Enstitüsünün (KRDAE) işlettiği geniş bant sismometre ağı tarafından kaydedilmiştir. Modellemeler, ana şokun ve en az bir artçı şokun (2.83.6) kaydedildiği beş istasyonda toplamda on farklı istasyon kullanılarak yapılmıştır. Kayıtçı istasyonlar ile depremler arasındaki mesafe 17 km ile 121 km arasında, modellenen deprem ile modellemede AGF olarak kullanılan depremlerin hiposantırları arasındaki mesafe ise 0.73 km ile 1.64 km arasında değişmektedir. Kaydedilmiş ve benzeşimi elde edilmiş dalga formlarının benzerlikleri P dalgası ilk varışları, S-P dalgalarının varışlarındaki zaman farklılığı, kayıt süresi, maksimum yer hızı, Fourier spektrumu ve enerji dağılımları gibi farklı parametreler açısından incelenmiştir. Elde edilen sonuçlar özellikle heterojen kabuk yapısına sahip Marmara bölgesi gibi alanlarda, AGF yönteminin yer hareketi benzeşimlerinin elde edilmesinde kullanılabilecek uygun bir yöntem olduğunu doğrulamaktadır

Anahtar Kelimeler

Ampirik Green fonksiyon, deprem benzeşimi, marmara bölgesi

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Toplam 178 adet kaynakça vardır.

Ayrıntılar

Birincil Dil	Türkçe
Bölüm	Makaleler
Yazarlar	Aydın Mert Bu kişi benim Yasin Fahjan Bu kişi benim Ali Pınar Bu kişi benim Lawrence Hutchıngs Bu kişi benim
Yayımlanma Tarihi	1 Şubat 2014
Gönderilme Tarihi	24 Mart 2015
Yayımlandığı Sayı	Yıl 2014 Cilt: 35 Sayı: 1

Kaynak Göster

EndNote	Mert A, Fahjan Y, Pınar A, Hutchıngs L (01 Şubat 2014) Marmara Bölgesinde Ampirik Green Fonksiyon Yöntemiyle Deprem Benzeşimlerinin Elde Edilmes. Yerbilimleri 35 1 141–168.

Makale Dosyaları

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