Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses

BİRGÖREN, Gülüm; ÖZEL, Oğuz; SİYAHİ, Bilge

Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses

Gülüm BİRGÖREN, (Boğaziçi Üniversitesi, Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü, Çengelköy, İstanbul, Türkiye)

Oğuz ÖZEL, (İstanbul Üniversitesi, Mühendislik Fakültesi, Jeofizik Mühendisliği Bölümü, İstanbul, Türkiye)

Bilge SİYAHİ (Gebze Yüksek Teknoloji Enstitüsü, Deprem ve Yapı Bilimleri Anabilim Dalı, Kocaeli, Türkiye)

Turkish Journal of Earth Sciences

3 0

Yıl: 2009 Cilt: 18 Sayı: 2 Sayfa Aralığı: 315 - 329 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses

Öz:

Bölgesel S-dalgası hızının derinlikle değişimi ve temel kayası derinlik dağılımı jeolojik formasyonların büyütme potansiyellerinin anlaşılması bakımından sismik tehlike ve deprem hareketi karakteristiklerinin tahmininde önemli rol oynamaktadır. Bu çalışmada İstanbul bölgesi için Paleozoyik temel kayası üzerindeki Tersiyer–Kuvarterner yaşlı tabakaların (bundan sonra örtü olarak adlandırılacaktır) kalınlığı ile rezonans frekansı arasında ampirik bir ilişki hesaplanmış ve şehrin temel kayası derinlik dağılımı sunulmuştur. Ampirik ilişki, mikrotremor analizleri ve tek boyutlu (1D) S-dalgası hız profillerinden elde edilen transfer fonksiyonlarının karşılaştırılması ile hesaplanmıştır. Bu amaçla bölgede var olan 15 kuyudaki standart penetrasyon testi (SPT) darbe sayıları ile standart zemin tanımlamalarından oluşan geoteknik veriler değerlendirilmiş ve kuyular civarında tek istasyonlu mikrotremor ölçümleri yapılmıştır. Her kuyu için temel kayası derinliği, analitik transfer fonksiyonların şekli ve rezonans frekansı arazi ölçümlerinden elde edilen transfer fonksiyonlarına uyum sağlayacak şekilde, hız-derinlik profillerine mühendislik kayası katmanının eklenmesi ile hesaplanmıştır. Bu hesaplamalardan rezonans frekans ile Paleozoyik temel kayası üzerindeki örtünün kalınlığı arasında ampirik bir denklem elde edilmiştir. Bu ampirik ilişkinin, rezonans frekansı bilinen 86 kuvvetli yer hareketi kayıt istasyonunda kullanılması ile İstanbul’da kentsel nüfusun yoğun olduğu bölgelerin altındaki temel kayası derinlik değişimi hesaplanmıştır.

Anahtar Kelime:

Konular: Jeoloji

İatanbul'un Güney kıyılarının temel kayası derinliği haritalaması: analitik ve deneysel analizlerin karşılaştırılması

Öz:

Local S-wave velocity-depth profiles and bedrock depth distribution are key factors in assessing seismic hazard and earthquake ground motion characteristics since they allow determination of the amplification potential of geological formations overlying bedrock. In this study, an empirical relationship between the thickness of Tertiary–Quaternary sediments (hereafter referred as cover) overlying Palaeozoic bedrock and their resonance frequencies was calculated for the İstanbul region and the bedrock depth distribution beneath the city was presented. The relationship was investigated by comparing transfer functions obtained from single station microtremor analyses and one-dimensional (1D) S-wave velocity profiles at sites where shallow velocity structure is known. Geotechnical data consisting of standard penetration test (SPT) blow counts and standard soil descriptions were evaluated from 15 boring sites and microtremor measurements were carried out. The bedrock depth of each site was determined by computing analytical transfer functions to fit the resonance frequency and the shape of experimental transfer functions. Based on those results, a relationship between the resonance frequency and the thickness of the cover was derived. Finally, the bedrock distribution beneath populated areas of İstanbul was obtained by applying the derived relationship to 86 strong-motion sites, where the resonance frequencies are known.

Anahtar Kelime:

Konular: Jeoloji

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	BİRGÖREN G, ÖZEL O, SİYAHİ B (2009). Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. , 315 - 329.
Chicago	BİRGÖREN Gülüm,ÖZEL Oğuz,SİYAHİ Bilge Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. (2009): 315 - 329.
MLA	BİRGÖREN Gülüm,ÖZEL Oğuz,SİYAHİ Bilge Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. , 2009, ss.315 - 329.
AMA	BİRGÖREN G,ÖZEL O,SİYAHİ B Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. . 2009; 315 - 329.
Vancouver	BİRGÖREN G,ÖZEL O,SİYAHİ B Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. . 2009; 315 - 329.
IEEE	BİRGÖREN G,ÖZEL O,SİYAHİ B "Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses." , ss.315 - 329, 2009.
ISNAD	BİRGÖREN, Gülüm vd. "Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses". (2009), 315-329.

APA	BİRGÖREN G, ÖZEL O, SİYAHİ B (2009). Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. Turkish Journal of Earth Sciences, 18(2), 315 - 329.
Chicago	BİRGÖREN Gülüm,ÖZEL Oğuz,SİYAHİ Bilge Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. Turkish Journal of Earth Sciences 18, no.2 (2009): 315 - 329.
MLA	BİRGÖREN Gülüm,ÖZEL Oğuz,SİYAHİ Bilge Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. Turkish Journal of Earth Sciences, vol.18, no.2, 2009, ss.315 - 329.
AMA	BİRGÖREN G,ÖZEL O,SİYAHİ B Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. Turkish Journal of Earth Sciences. 2009; 18(2): 315 - 329.
Vancouver	BİRGÖREN G,ÖZEL O,SİYAHİ B Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses. Turkish Journal of Earth Sciences. 2009; 18(2): 315 - 329.
IEEE	BİRGÖREN G,ÖZEL O,SİYAHİ B "Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses." Turkish Journal of Earth Sciences, 18, ss.315 - 329, 2009.
ISNAD	BİRGÖREN, Gülüm vd. "Bedrock depth mapping of the coast south of İstanbul: comparison of analytical and experimental analyses". Turkish Journal of Earth Sciences 18/2 (2009), 315-329.