2D soil and engineering-seismic bedrock modeling of eastern part of Izmir inner bay/Turkey

Pamuk, Eren; Akgün, Mustafa; Özdağ, Özkan Cevdet; Gönenç, Tolga

doi:10.1016/j.jappgeo.2016.12.016

Cited by 38 publications

(14 citation statements)

References 25 publications

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“…Tanaka (1954, 1961) are pioneers for investigation of short period microtremors and estimation of the site effect with several studies. Nakamura (1989) the H/V spectral ratio method has widely used for evaluating the effect of soil amplification on the earthquake shaking (Pamuk et al, 2017a) firstly determined microtremor features. Nogoshi and Igarashi (1970) firstly determined this method.…”

Section: Microtremor Hvsr Methodsmentioning

confidence: 99%

Vulnerability Index Assessment Using Neural Networks (Viann): A Case Study of Nicosia, Cyprus

Dindar

Dimililer

Özdağ

et al. 2017

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Many scholars have used microtremor applications to evaluate the vulnerability index. In order to reach fast and reliable results, microtremor measurement is preferred as it is a cost-effective method. In this paper, the vulnerability index will be reviewed by utilization of microtremor measurement results in Nicosia city. 100 measurement stations have been used to collect microtremor data and the data were analysed by using Nakamura's method. The value of vulnerability index (Kg) has been evaluated by using the fundamental frequency and amplification factor. The results obtained by the artificial neural network (ANN) will be compared with microtremor measurements. Vulnerability Index Assessment using Neural Networks (VIANN) is a backpropagation neural network, which uses the original input microtremor Horizontal Vertical Spectrum Ratio (HVSR) spectrum set. A 3-layer back propagation neural network which contains 4096 input, 28 hidden and 3 output neurons are used in this suggested system. The output neurons are classified according to acceleration sensitivity zone, velocity zones, or displacement zones.

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Section: Microtremor Hvsr Methodsmentioning

confidence: 99%

Vulnerability Index Assessment Using Neural Networks (Viann): A Case Study of Nicosia, Cyprus

Dindar

Dimililer

Özdağ

et al. 2017

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Bu etken kullanılarak, birbirinden farklı fiziksel yapıya sahip ortamlar arasındaki empedans farkı ve olası yerel zemin etkisi tanımlanabilir. Mikrotremor yöntemiyle ilgili teorik ve deneysel pek çok çalışma yapılmıştır [5,7,9,10,[19][20][21][22][23][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. Çalışma alanında bölgenin baskın periyot/frekans ve büyütme değerlerinin belirlenmesi amacıyla 220 noktada tek istasyon mikrotremor ölçümleri yapılmıştır (Şekil 1b).…”

Section: Mikrotremor (H/v Spektral Oran Nakamura) Yöntemiunclassified

Jeofizik Verilerinden Elde Edilen Sismik Zayıflık İndisinin Yapı Hasar Dağılımının Belirlenmesinde Kullanılabilirliği

Akkaya

2020

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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ÖzJeofizik yöntemlerden biri olan mikrotremor yönteminin mühendislik uygulamalarındaki kullanımı gün geçtikçe artmaktadır. Mikrotremor verilerinin spektral oranından elde edilen zemin hâkim titreşim periyodu ve büyütme değerleri kullanılarak sismik zayıflık indisi (Kg) hesaplanabilmektedir. Kg zemin dinamik özelliklerine bağlı olarak değişen bir parametredir. Bu parametre ile bir alanın kuvvetli yer hareketine karşı dayanıklı veya zayıf kalma durumunun noktasal olarak değerlendirilmesi yapılabilmektedir. Çalışmada, Van yerleşim alanında 220 noktada mikrotremor ölçümleri alınarak yerleşim alanı için zayıflık indisi haritası oluşturulmuştur. Özellikle Van Gölüne yakın kesimlerde ve yapı yoğunluğunun olduğu merkez bölgelerde tehlike düzeyinin ve sismik zayıflık indisinin yüksek olduğu belirlenmiştir. 2011 Van depremi (Mw=7.1) sonrası bölgede incelenen binaların hasar durumları oluşturulan zayıflık indisi haritasına yerleştirilmiş ve yapıların hasar durumlarının zayıflık indeksi ile ilişkili olabileceği gözlenmiştir. Çalışma alanında özellikle Van Gölüne yakın kesimlerinde hem gevşek-suya doygun zemin yapısı hem yapı kalitesi hem de yüksek Kg değerlerinin elde edilmesi olası büyük bir depremde ortaya çıkabilecek yüksek ivme değerlerinde makaslama deformasyonu seviyesine bağlı zemin davranışının hasara neden olan plastik davranış ve göçme davranışına dönüşebileceği tespit edilmiştir. Elde edilen bulgular yapısal hasarlarda yapı kalitesinin yanı sıra zemin tabakalarının dinamik davranışlarının ve yerel zemin koşullarının da etkili olduğunu bir kez daha ortaya koymuştur.

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“…In these studies, soil bedrock models are prepared in one (1D) and two (2D) dimensions by using in situ methods (Nortey et al, 2018). Nowadays, MASW, Seismic Refraction, Up Hole, Down Hole, Cross Hole Seismic Studies, Single Station Microtremor, Refraction Microtremor and Array Microtremor methods are widely used as in situ methods for geophysical site investigations (Olona-Allué et al, 2008;Margaryan and Yokoi, 2008;Yalçınkaya, 2010;Claprood et al, 2011;Akgün et al, 2013a;Akgün et al, 2013b;Özdağ et al, 2015;Mohamed et al, 2016;Pamuk et al, 2017). Nicosia, which constitutes the study area, is a second-degree risky earthquake zone throughout the island of Cyprus.…”

Section: Introductionmentioning

confidence: 99%

The assessment of local site effects and dynamic behaviour in Nicosia, Cyprus

Dindar
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Akgün
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Atalar
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et al. 2021

Geofizika (Online)
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Single-station microtremor measurements were conducted to investigate earthquake and soil behaviour for the first time in Nicosia, Cyprus. Cyprus is located in a tectonically complex area in the Eastern Mediterranean where three plates meet. The study area was chosen to cover the areas to be opened for new development. Nicosia, the capital of Cyprus, is also the island's most important cultural, industrial, commercial, and transportation centre. The study creates base maps for the soil to assess earthquake resistance crucial for construction. Microtremor Method was applied at 100 stations and the Multi-Channel Analysis of Surface Waves (MASW) method was used at 52 stations. Also, RefractionMicrotremor (Re-Mi) and L-Shaped Spatial Autocorrelation (L-SPAC) methods were carried out at 17 stations to substantiate the research. The results of the microtremor method indicate that the predominant soil period values have an average of 1 second and pre-dominant peak period values are generally found between 0.1 to 5 s at the study area. Peak amplitude values are observed between 1 and 2.4. The Vulnerability Index Parameter (Kg) exceeded 20 at the central and the southern stations, and Kg values change between 7 and 54 units. The Kg values were found to be higher than 20 in soils where shear wave velocity is lower than 760 m/s. At the same time, the values of the predominant peak period were greater than 1 second. Cyprus is located in the Alpine Himalayan earthquake zone. The Cyprus Arc is known as the main seismic source of the island, It constitutes the tectonic border among African and Eurasian lithospheric plates in the region. During an earthquake in Nicosia, seismic waves will be amplified by an average of 1.5 times and soil deformation will occur due to the exceeding elastic limits. The results provided important insight into soil behaviour and indicated its reactions in a potential earthquake.

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2D soil and engineering-seismic bedrock modeling of eastern part of Izmir inner bay/Turkey

Cited by 38 publications

References 25 publications

Vulnerability Index Assessment Using Neural Networks (Viann): A Case Study of Nicosia, Cyprus

Vulnerability Index Assessment Using Neural Networks (Viann): A Case Study of Nicosia, Cyprus

Jeofizik Verilerinden Elde Edilen Sismik Zayıflık İndisinin Yapı Hasar Dağılımının Belirlenmesinde Kullanılabilirliği

The assessment of local site effects and dynamic behaviour in Nicosia, Cyprus

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