Evolution of seismic hazard maps in Turkey

Akkar, Sinan; Azak, Tuba Eroğlu; Çan, Tolga; Çeken, Ulubey; Tümsa, Mine Betül Demircioğlu; Duman, Tamer Y.; Erdik, Mustafa; Ergintav, Semih; Kadirioğlu, Filiz Tuba; Kalafat, Doğan; Kale, Özkan; Kartal, Recai Feyiz; Kekovali, K.; Kılıç, Tuğbay; Özalp, Selim; Poyraz, Selda Altuncu; Şeşetyan, Karin; Tekin, Senem; Yakut, Ahmet; Yılmaz, Mustafa Tolga; Yücemen, M. Semih; Zülfikar, Ö.

doi:10.1007/s10518-018-0349-1

Cited by 60 publications

(34 citation statements)

References 50 publications

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“…Seismic risk assessments have been made in previous studies (e.g. Demircioğlu et al, 2017;Akkar et al 2018) and the region between the NEAF and the NAF in the south of the Eastern Pontides was assessed in the medium to high risk group.…”

Section: Evaluation Of the Seismic Activity Of The Eastern Pontidesmentioning

confidence: 99%

Geomorphic evidence for active tectonic deformation in the coastal part of Eastern Black Sea, Eastern Pontides, Turkey

et al. 2018

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The Eastern Pontides (EP), which is the under transpressional deformation zone, is an active mountain belt that has been rising rapidly since the Cenozoic era because of the Arabian-Eurasian convergence. Morphometric studies have been performed to investigate the tectonic activity of this region and better understand the characteristics of the faults geomorphologically; the faults control the mountain fronts in the drainage basin of the EP. The results show the Hypsometric Curve (HC)-Hypsometric Integral (0.37-HI-0.67), Basin-Shaped Analysis (1.2-B s-7), Valley-Floor-Width to Height-Ratio (0.4-V f-1.2) and Asymmetry Factor (35-AF-81) applied to 46 drainage basins together with 9 tectonically controlled geomorphic indices (1.2-S mf-1.5) and a Stream Length Gradient (30-S L-120) indicate that the EP is tectonically active, and when the areas are evaluated according to S mf and V f analyses, the tectonic level is relatively high. According to our conceptual model for the uplifting of the EP, with respect to field studies and morphometric analysis, (i) the EP is the active deformation zone and has a "push-up" geometry in conjunction with the North Anatolian Fault; (ii) the EP is progressively uplifting at a rate of more than 0.5 mm/yr in along with the thrust faults of the Black Sea Fault (BSF) and Borjomi-Kazbegi Fault (BKF).

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Section: Evaluation Of the Seismic Activity Of The Eastern Pontidesmentioning

confidence: 99%

Geomorphic evidence for active tectonic deformation in the coastal part of Eastern Black Sea, Eastern Pontides, Turkey

et al. 2018

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“…In green: negative amplifications. Figure 28 presents a comparison of the 475-year PGA distribution of our Poisson model with the mean 475-year PGA from the updated PSHA model of Turkey [71][72][73]. It would be difficult to provide a full description of the source modelling in the latter; however, we may say that the new Turkish seismic hazard model is composed of two independent source models, an area source model (assigned 50% weight in the final logic tree) and fault source and smoothed seismicity model (again weighted as 50% in the final logic tree).…”

Section: Discussion Of the Results And Comparisons With Other Studiesmentioning

confidence: 99%

“…Based on the evaluation of regional earthquake ground motion recordings and statistical ground motion prediction equation (GMPE) selection methods, [70] proposed an up-to-date logic tree for the characterisation of the ground motion in Turkey, which was later used in the update of the Turkish national seismic hazard maps [71][72][73]. As the main focus of the present study is an update of the source characterization in the Marmara region, we adopt for all source models (fault and background) the GMPE logic tree proposed by [70] for active shallow crustal regions, which consists of four models and associated weights as presented in Table 5.…”

Section: Ground Motion Characterisation and Logic Treementioning

confidence: 99%

Evaluation of The Seismic Hazard in The Marmara Region (Turkey) Based on Updated Databases

Şeşetyan

Tümsa²,

Akinci

2019

Geosciences

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The increase in the wealth of information on the seismotectonic structure of the Marmara region after two devastating earthquakes (M7.6 Izmit and M7.2 Duzce events) in the year 1999 opened the way for the reassessment of the probabilistic seismic hazard in the light of new datasets. In this connection, the most recent findings and outputs of different national and international projects concerning seismicity and fault characterization in terms of geometric and kinematic properties are exploited in the present study to build an updated seismic hazard model. A revised fault segmentation model, alternative earthquake rupture models under a Poisson and renewal assumptions, as well as recently derived global and regional ground motion prediction equations (GMPEs) are put together in the present model to assess the seismic hazard in the region. Probabilistic seismic hazard assessment (PSHA) is conducted based on characteristic earthquake modelling for the fault segments capable of producing large earthquakes and smoothed seismicity modelling for the background smaller magnitude earthquake activity. The time-independent and time-dependent seismic hazard results in terms of spatial distributions of three ground-shaking intensity measures (peak ground acceleration, PGA, and 0.2 s and 1.0 s spectral accelerations (SA) on rock having 10% and 2% probabilities of exceedance in 50 years) as well as the corresponding hazard curves for selected cities are shown and compared with previous studies.

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“…Deprem tasarım yüklerinin hesaplanmasında 1990'lı yılların sonlarına kadar deprem bölgeleri yaklaşımının dünya genelinde yaygın olarak kullanıldığı bilinmektedir [2]. Son zamanlarda bu yaklaşımın aksayan bazı yönlerinin olduğu görülmektedir.…”

Section: Introductionunclassified

“…Bu çalışmalar hakkında özet bilgi içeren ve ilgili çalışmaların tümüne atıf yapan Akkar vd. [2] konu ile ilgili ayrıntılı bilgi edinmek için incelenebilir.…”

Section: Introductionunclassified

Deprem Bölgesi Haritasından Kontur İçeren Deprem Tehlike Haritasına Geçişin Çeşitli Yapılarda Tasarım ve Analiz Deprem Yükü Taleplerine Etkisi

Şahin

Durucan

2020

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Bu araştırma, deprem bölgesi harita konseptinden (TDY-2007) kontur içerikli deprem tehlike haritasına (TDY-2019) geçiş nedeniyle oluşan değişikliğin yapılar üzerindeki etkilerini değerlendirmeyi amaçlamaktadır. Çalışmada, ilk olarak Türkiye'nin depremslliği yüksek olan bir bölgesinden seçilen örnek noktaların koordinat bazlı elastik ve azaltılmış tasarım ivme spektrumları elde edilmiştir. Elastik tasarım ivme spektrumlarının karşılaştırmalı analizleri için 4 zemin sınıfı ve 3 performans seviyesi ana parametre olarak kabul edilmiştir. Azaltılmış tasarım ivme spektrumlarının karşılaştırılması için; (i) 4 zemin sınıfı, (ii) 3 performans seviyesi, (iii) 4 bina tipi ve (iv) 2 taşıyıcı sistem tipi ana parametre olarak seçilmiştir. Daha sonra yeni deprem yönetmeliğinden elde edilen bu spektrumlar, Türkiye'deki yapıların tasarımı için kullanılan önceki deprem yönetmeliğinin tasarım ivme spektrumları ile karşılaştırılmıştır. Tasarım ivme spektrumu, (i) spektral elastik değerler ve (ii) azaltılmış tasarım spektral ivme değerleri açısından karşılaştırılmıştır. Karşılaştırmalı sonuçlar, temel olarak kısa periyot bölgesinde, güncel tasarım yaklaşımından elde edilen spektral ivme değerlerinin, önceki tasarım yaklaşımı kullanılarak elde edilen spektrumlardan önemli ölçüde daha yüksek olduğunu göstermiştir. Bununla birlikte, daha uzun periyot aralığı için, eski tasarım spektrumu kullanarak elde edilen spektral değerler, yeni tasarım spektrumları hesaplama prosedürü kullanılarak hesaplananlardan daha büyüktür.

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Evolution of seismic hazard maps in Turkey

Cited by 60 publications

References 50 publications

Geomorphic evidence for active tectonic deformation in the coastal part of Eastern Black Sea, Eastern Pontides, Turkey

Geomorphic evidence for active tectonic deformation in the coastal part of Eastern Black Sea, Eastern Pontides, Turkey

Evaluation of The Seismic Hazard in The Marmara Region (Turkey) Based on Updated Databases

Deprem Bölgesi Haritasından Kontur İçeren Deprem Tehlike Haritasına Geçişin Çeşitli Yapılarda Tasarım ve Analiz Deprem Yükü Taleplerine Etkisi

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