IDENTIFICATION OF THE SOURCE TYPES OF THE SEISMIC EVENTS OCCURRED ON THE EUROPEAN SIDE OF ISTANBUL

Evrim Yavuz

Makale detayları

IDENTIFICATION OF THE SOURCE TYPES OF THE SEISMIC EVENTS OCCURRED ON THE EUROPEAN SIDE OF ISTANBUL

Yazarlar:

Evrim Yavuz

Yayıncı:

Süleyman Demirel University

Ana Başlıklar:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi:

Mühendislik Bilimleri ve Tasarım Dergisi Vol.11 Issue 1, pp.279-297

Belge Tipi:

Makale

Yayın Tarihi:

3/2023

Belge Dili:

Türkçe

Document ID (Org No.):

2001285526

pISSN:

1308-6693

Anahtar kelimeler:

Özet:

 Istanbul, the densest city of our country in terms of population, industry, construction, and tourism, is tectonically under the control of the Main Marmara Fault lying to the south. The need for industrial raw materials is provided by the quarry operations on the European side. Therefore, both natural and artificial micro-seismic activity is observed in the region. Errors may appear in the identification of source types due to the energy content, insufficient numberdistribution of seismic stations, and inaccurate picking of wave phases etc. Secondary analyzes are needed to determine more reliable source types. In this study, source type determination analyzes were performed for 270 waveforms on 195 seismic events with a magnitude of M2.8 that occurred in the European Side of Istanbul between 2007 and 2021 were analyzed at six earthquake stations operated by Boğaziçi University Kandilli Observatory and Earthquake Research Institute Regional Earthquake and Tsunami Monitoring Center KOERI-RETMC. The source types of the events were determined visually, independently of the catalog information. Amplitude ratio and complexity methods were applied by using vertical component seismograms. Method-based success rate was calculated by using Linear and Quadratic Discrimination Functions for statistical classification. As a result, for 195 seismic events, 28 earthquakes and 167 quarry blasts were determined. With a more reliable source type identification, homogeneous catalogs could be created and researchers could prevented time loss by performing secondary analysis in studies such as seismicity and earthquake hazard analysis.

 Istanbul, the densest city of our country in terms of population, industry, construction, and tourism, is tectonically under the control of the Main Marmara Fault lying to the south. The need for industrial raw materials is provided by the quarry operations on the European side. Therefore, both natural and artificial micro-seismic activity is observed in the region. Errors may appear in the identification of source types due to the energy content, insufficient numberdistribution of seismic stations, and inaccurate picking of wave phases etc. Secondary analyzes are needed to determine more reliable source types. In this study, source type determination analyzes were performed for 270 waveforms on 195 seismic events with a magnitude of M2.8 that occurred in the European Side of Istanbul between 2007 and 2021 were analyzed at six earthquake stations operated by Boğaziçi University Kandilli Observatory and Earthquake Research Institute Regional Earthquake and Tsunami Monitoring Center KOERI-RETMC. The source types of the events were determined visually, independently of the catalog information. Amplitude ratio and complexity methods were applied by using vertical component seismograms. Method-based success rate was calculated by using Linear and Quadratic Discrimination Functions for statistical classification. As a result, for 195 seismic events, 28 earthquakes and 167 quarry blasts were determined. With a more reliable source type identification, homogeneous catalogs could be created and researchers could prevented time loss by performing secondary analysis in studies such as seismicity and earthquake hazard analysis.

 Istanbul, the densest city of our country in terms of population, industry, construction, and tourism, is tectonically under the control of the Main Marmara Fault lying to the south. The need for industrial raw materials is provided by the quarry operations on the European side. Therefore, both natural and artificial micro-seismic activity is observed in the region. Errors may appear in the identification of source types due to the energy content, insufficient numberdistribution of seismic stations, and inaccurate picking of wave phases etc. Secondary analyzes are needed to determine more reliable source types. In this study, source type determination analyzes were performed for 270 waveforms on 195 seismic events with a magnitude of M2.8 that occurred in the European Side of Istanbul between 2007 and 2021 were analyzed at six earthquake stations operated by Boğaziçi University Kandilli Observatory and Earthquake Research Institute Regional Earthquake and Tsunami Monitoring Center KOERI-RETMC. The source types of the events were determined visually, independently of the catalog information. Amplitude ratio and complexity methods were applied by using vertical component seismograms. Method-based success rate was calculated by using Linear and Quadratic Discrimination Functions for statistical classification. As a result, for 195 seismic events, 28 earthquakes and 167 quarry blasts were determined. With a more reliable source type identification, homogeneous catalogs could be created and researchers could prevented time loss by performing secondary analysis in studies such as seismicity and earthquake hazard analysis.

 Nüfus, sanayi, yapılaşma ve turizm açısından ülkemizin en yoğun kenti olan İstanbul, tektonik olarak, güneyinde uzanan Ana Marmara Fayının kontrolü altındadır. Endüstriyel hammadde ihtiyacı ise Avrupa Yakasındaki taş ocağı işletmeleri tarafından sağlanmaktadır. Dolayısıyla, bölgede hem doğal hem de yapay kaynaklı mikro-sismik aktivite gözlenmektedir. Olayların enerji içeriği, sismik istasyon sayısınındağılımının yeterli olmaması ve dalga fazlarının doğru seçilememesi vb. nedenlerden dolayı da kaynak türleri tanımlanmasında hatalar gözükebilmektedir. Daha güvenilir kaynak türü belirlenmesi ise ikincil analizler ile yapılmaktadır. Çalışmada, İstanbul Avrupa Yakasında 2007-2021 yılları arasında meydana gelen, büyüklüğü M2.8 olan 195 adet sismik olayın Boğaziçi Üniversitesi Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü Bölgesel Deprem ve Tsunami İzleme Merkezi KRDAE-BDTİM tarafından işletilen altı adet deprem istasyonunda kayıt edilen 270 adet dalga formu için kaynak türü belirleme analizleri yapılmıştır. Olayların kaynak türleri katalog bilgilerinden bağımsız şekilde, görsel olarak belirlenerek yola çıkılmıştır. Düşey bileşen sismogramları kullanılarak, genlik oranı ve karmaşıklık yöntemleri uygulanmıştır. İstatistiksel sınıflandırma için Lineer ve Karesel Ayrımlaştırma Fonksiyonları kullanılarak, yöntem bazlı başarı oranları hesaplanmıştır. Sonuç olarak, 195 adet sismik olayın, 28 tanesinin deprem, 167 adetinin patlatma kaynaklı olduğu tespit edilmiştir. Daha güvenilir kaynak türü tanımlaması ile homojen kataloglar oluşturulmakta ve depremsellik, deprem tehlike analizleri gibi çalışmalarda araştırmacıların ikincil analizler ile zaman kaybı yaşamasının önüne geçilebilmektedir.

Makale detayları

IDENTIFICATION OF THE SOURCE TYPES OF THE SEISMIC EVENTS OCCURRED ON THE EUROPEAN SIDE OF ISTANBUL

Yazarlar:

Evrim Yavuz

Yayıncı:

Süleyman Demirel University

Ana Başlıklar:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi:

Mühendislik Bilimleri ve Tasarım Dergisi Vol.11 Issue 1, pp.279-297

Belge Tipi:

Makale

Yayın Tarihi:

3/2023

Belge Dili:

Türkçe

Document ID (Org No.):

2001285526

pISSN:

1308-6693

Discriminant Function

Earthquake

Istanbul

Blast

Quarries

Ayrımlaştırma Fonksiyonu

Deprem

İstanbul

Patlatma

Taş ocakları

Sayı

Makale detayları

Yazarlar: Evrim Yavuz

Yayıncı: Süleyman Demirel University

Ana Başlıklar: Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi: Mühendislik Bilimleri ve Tasarım Dergisi Vol.11 Issue 1, pp.279-297

Belge Tipi: Makale

Yayın Tarihi: 3/2023

Belge Dili: Türkçe

Document ID (Org No.): 2001285526

pISSN: 1308-6693

Sayı

Yazarlar:

Evrim Yavuz

Yayıncı:

Süleyman Demirel University

Ana Başlıklar:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi:

Mühendislik Bilimleri ve Tasarım Dergisi Vol.11 Issue 1, pp.279-297

Belge Tipi:

Makale

Yayın Tarihi:

3/2023

Belge Dili:

Türkçe

Document ID (Org No.):

2001285526

pISSN:

1308-6693