Field reconnaissance and structural assessment of the October 30, 2020, Samos, Aegean Sea earthquake: an example of severe damage due to the basin effect

Onat, Onur; Yön, Burak; Öncü, Mehmet Emin; Varolgüneş, Sadık; Karaşi̇n, Abdulhalim; Cemalgil, Selim

doi:10.1007/s11069-021-05173-y

Cited by 14 publications

(1 citation statement)

References 52 publications

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“…Onat vd. [23] çalışmalarında spesifik bir bölgenin, geçmişteki ve günümüzdeki sismotektonik özelliklerini, mevcut yapı stokunu ve depremden önceki yapısal koşulları kısaca sunmak, yapısal performansı değerlendirmek ve depremden kaynaklanan hasarları ve havza etkisinden kaynaklanan hasarları sınıflandırmayı amaçlamışlardır.…”

Section: Introductionunclassified

Sismik dirençlilik ve spektral parametrelerin etkisi

KARASİN

2023

DÜMF MD

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Sismik etkilere karşı yapıların dayanım ve dayanıklılığını değerlendirmek ve depremlerin neden olabileceği hasarları en aza indirmek, deprem mühendisliğinin temel hedeflerindendir. Bu çerçevede deprem mühendisliğinde oldukça güncel olan sismik dirençlilik kavramı son yıllarda giderek önem kazanmaktadır. Bu çalışmada, herhangi bir afet sonrası yapıların eski haline dönebilme becerisi olarak tanımlanabilen Sismik dirençlilik konsepti, formülasyonları ile birlikte ele alınmıştır. Konsept olarak izah edilen sismik dirençlilik kavramının dirençlilik indeksi ile sayısallaştırılması bu indeksi oluşturan parametrelerden biri olan spektral ivme değeri değişken olarak seçilmiştir. Spektral ivme değişimine yaklaşımı farklı olan TBDY2018 ve DBYYHY2007 yönetmelikleri çerçevesinde 7 katlı bir betonarme yapı için Türkiye’nin 7 farklı bölgesinde 7 farklı şehir seçilmiş ve hesaplanan PGA değerleri esas alınarak kırılganlık eğrilerinden elde edilen dirençlilik indeksleri karşılaştırılmıştır. Bu karşılaştırma ile dirençlilik indeksi DBYYHY2007’e göre tüm şehirlerde sabit %99,7 iken değişken PGA değerleri ile TBDY2018’e göre %79,7-%99,6 aralığında hesaplanmıştır.

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Section: Introductionunclassified

Sismik dirençlilik ve spektral parametrelerin etkisi

KARASİN

2023

DÜMF MD

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The analysis of Yunnan Dayao basin effect based on microtremor test and numerical simulation

He,

Zhang,

Liu

et al. 2024

Earthquake Engineering and Resilience

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Microtremor tests and finite element numerical simulations were used to analyze the seismic ground motion effects of the Yunnan Dayao sedimentary basin. The results of the microtremor relative to the reference point spectral ratio (HS/HR) method showed that the spectral ratio curves of each observation point in Dayao basin show multipeak characteristics, indicating that the site consists of different soil layers; the predominant frequencies of each observation point mainly are 6~9 Hz in the basin and there are lots of differences in the predominant frequencies of different observation points, which indicate that the site stiffness of each observation point is different; the differences of spectral ratios between the east–west directions (EW) and the north–south directions (NS) reveal the site's anisotropy. The amplification coefficient characteristics of each observation point in the basin obtained by numerical simulation show that the predominant frequency is 6 ~ 9 Hz; the amplification coefficients of each observation point are different; the edge effect and the focusing effect amplify the seismic ground motion in the basin; the different amplification coefficients of the two sub‐basins reflect the significant effect of the basin soil layers' differences on the seismic ground motion, the site is softer and amplification coefficients are larger; the slope degree of basin edges significantly affects the seismic ground motion near the basins edge, the amplification coefficients of the slope steeper and amplification coefficients larger. This study demonstrates that the microtremor test spectral ratio (HS/HR) method has good reliability applied to the analysis of basin effect and combining the finite element numerical simulation method is more effective in revealing the basin effect mechanism.

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Geotechnical reconnaissance findings of the October 30 2020, Mw7.0 Samos Island (Aegean Sea) earthquake

Ziotopoulou

Çetin

Pelekis

et al. 2022

Bull Earthquake Eng

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On October 30, 2020 14:51 (UTC), a moment magnitude (Mw) of 7.0 (USGS, EMSC) earthquake occurred in the Aegean Sea north of the island of Samos, Greece. Turkish and Hellenic geotechnical reconnaissance teams were deployed immediately after the event and their findings are documented herein. The predominantly observed failure mechanism was that of earthquake-induced liquefaction and its associated impacts. Such failures are presented and discussed together with a preliminary assessment of the performance of building foundations, slopes and deep excavations, retaining structures and quay walls. On the Anatolian side (Turkey), and with the exception of the Izmir-Bayrakli region where significant site effects were observed, no major geotechnical effects were observed in the form of foundation failures, surface manifestation of liquefaction and lateral soil spreading, rock falls/landslides, failures of deep excavations, retaining structures, quay walls, and subway tunnels. In Samos (Greece), evidence of liquefaction, lateral spreading and damage to quay walls in ports were observed on the northern side of the island. Despite the proximity to the fault (about 10 km), the amplitude and the duration of shaking, the associated liquefaction phenomena were not pervasive. It is further unclear whether the damage to quay walls was due to liquefaction of the underlying soil, or merely due to the inertia of those structures, in conjunction with the presence of soft (yet not necessarily liquefied) foundation soil. A number of rockfalls/landslides were observed but the relevant phenomena were not particularly severe. Similar to the Anatolian side, no failures of engineered retaining structures and major infrastructure such as dams, bridges, viaducts, tunnels were observed in the island of Samos which can be mostly attributed to the lack of such infrastructure.

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Field reconnaissance and structural assessment of the October 30, 2020, Samos, Aegean Sea earthquake: an example of severe damage due to the basin effect

Cited by 14 publications

References 52 publications

Sismik dirençlilik ve spektral parametrelerin etkisi

Sismik dirençlilik ve spektral parametrelerin etkisi

The analysis of Yunnan Dayao basin effect based on microtremor test and numerical simulation

Geotechnical reconnaissance findings of the October 30 2020, Mw7.0 Samos Island (Aegean Sea) earthquake

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