Van Gölü Havzası ve Civarının Depremselliğine Genel Bir Bakış

Year 2023, , 317 - 333, 30.04.2023

Hamdi Alkan , Mustafa Toker , İsmail Akkaya

https://doi.org/10.53433/yyufbed.1138320

Abstract

Bu çalışma kapsamında, Van Gölü Havzası ve civarı için özellikle aletsel dönemde meydana gelmiş depremler ve bunların artçı şok verileri kullanılarak yapılan çalışmalardan elde edilen sonuçlar değerlendirilmiştir. Farklı sismolojik parametrelerin kullanıldığı bu çalışmaların bulguları derlenerek, bölgenin gelecekteki deprem riski/tehlikesi karşısındaki durumu ortaya koyulmaya çalışılmıştır. Aletsel ve tarihsel dönemde büyüklüğü 5.0 ve üzerinde olan birçok depremin meydana geldiği bölgede, son olarak 23 Ekim 2011 (Mw=7.1) ve 09 Kasım 2011 (Mw=5.8) tarihlerinde Van şehir merkezi civarında meydana gelen yıkıcı/hasar verici iki deprem bölgenin farklı özelliklerdeki aktif fay mekanizmalarına sahip olduğunu göstermiştir. Sonuç olarak, özellikle Van Gölü’nün hemen doğusu ile Çaldıran, Muradiye, Özalp, Saray ve Erciş civarında yakın gelecekte deprem tehlikesi diğer bölgelere göre büyük olarak ifade edilebilir. Ayrıca, Van Gölü Havzası ve civarının gerek jeofizik yöntemlere gerekse yapısal incelemelere dayalı farklı parametreler (zemin büyütmesi ve sismik hasar indisi gibi) kullanılarak zemin mühendislik özellikleri ve yapı-zemin etkileşimi açısından değerlendirmesi de bu çalışmada incelenmiştir.

Keywords

Deprem riski, Sismik hasar indisi, Van Gölü havzası, Yapı-zemin etkileşimi

An Overview of the Seismicity of Lake Van Basin and its Surrounding Area

Abstract

In the scope of this study, the findings obtained from the previous studies using the main shocks with their aftershocks that occurred mainly in the instrumental period are evaluated for the Van Lake Basin. Using the different seismological parameters, the results of these previous studies are compiled to reveal the future earthquake hazard/risk. Many destructive earthquakes with magnitudes greater than 5.0 occurred in the region during the instrumental and historical periods. Finally, two destructive/damaging earthquakes that occurred around the city center of Van on 23 October 2011 (Mw=7.1) and 9 November 2011 (Mw=5.8) showed that the region has active fault mechanisms with different characteristics. As a result, the earthquake hazard evaluation and forecasting in the near future show a higher seismic risk in the east of Lake Van, especially around Çaldıran, Muradiye, Özalp, Saray, and Erciş, than in other regions. In addition to seismic risk analyses, the evaluation of the Van Lake Basin and its surroundings, in terms of soil engineering properties and soil-structure interaction, using different parameters ( soil amplification and soil-structure interaction, etc.) based on geophysical methods and structural investigations, are also examined in this study.

Keywords

Lake Van basin, Seismic risk, Seismic vulnerability index, Soil-structure interaction

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