Mikrotremor Verilerinde Çapraz Spektrum ve Güç Spektrumu Tekniği Kullanılarak Zemin Büyütmesinin Belirlenmesi

Year 2023, Volume: 25 Issue: 73, 37 - 53, 26.01.2023

Mustafa Gürbüz

https://doi.org/10.21205/deufmd.2023257304

Abstract

Zemin büyütmesi ve etkin frekansların belirlenmesinde en çok tercih edilen yöntem Nakamura HVSR tekniğidir. Çapraz Spektrum ve Güç Spektrumu tekniği; yatay ve düşey bileşenin çapraz spektrumunun, düşey bileşenin güç spektrumuna oranlanması temeline dayanan bir tekniktir. Bu çalışmada, Burdur İl Merkezinde yapılan mikrotremor çalışmalarına ait sonuçlar HVSR Tekniği ile birlikte Çapraz Spektrum ve Güç Spektrumu Tekniğini kullanarak veriler değerlendirilmiş ve karşılaştırılmıştır. Her iki yöntemde elde edilen etkin frekanslar % 96 ile %100 arasında değişen bir oranda uyumlu sonuçlar vermiştir. Buna karşın bu frekanslarda, HVSR spektrumları zemin büyütmesi değerleri %20 ile % 60 daha büyük değerler vermiştir. HVSR tekniğinden hesaplanan hasar görebilirlik katsayıları 0,7 ile 4,3 arasında değişen değerler verirken, Çapraz Spektrum ve Güç Spektrumu tekniğinden hesaplanan hasar görebilirlik katsayıları ise 0,1 ile 4,8 arasında değişen değerler vermiştir. Genel olarak her iki yöntemde de yüksek frekanslarda büyütme değerlerinde bir artış olduğu görülmüştür. Zemin büyütmesi ve hasar görebilirlik değerlerinin büyük olduğu noktalar, Burdur İl merkezini etkileyecek bir deprem anında yüksek yapısal hasar riski olan alanları göstermesi bakımından önemlidir.

Keywords

Mikrotremor, Nakamura HVSR, Çapraz Spektrum ve Güç Spektrumu tekniği, etkin frekans, büyütme, hasar görebilirlik, Microtremor, Cross Spectrum and Power Spectrum technique, effective frequency, amplification, vulnerability.

Thanks

Burdur İl Merkezinde yapılan mikrotremor çalışmalarına yardım ve katkılarından dolayı Doç.Dr. Veli KARA'ya, makaleye yorum ve görüşleriyle katkıda bulunan Prof.Dr. Fatma GÜRBÜZ’e teşekkür ederim

Determination of Soil Amplification in Microtremor Data Using Cross Spectrum and Power Spectrum Techniques

Abstract

The most preferred method for soil amplification and determination of effective frequencies is the Nakamura HVSR technique. Cross Spectrum and Power Spectrum technique; It is a technique based on the ratio of the cross spectrum of the horizontal and vertical components to the power spectrum of the vertical component. In this study, the results of the microtremor studies which were conducted in the city center of Burdur, were evaluated and compared by using the Cross Spectrum and Power Spectrum technique together with the HVSR technique. The effective frequencies were obtained in both methods which gave concurring results varying between 96% and 100%. On the other hand, at these frequencies, the ground amplification values of the HVSR spectra contributed 20% to 60% higher values. The vulnerability coefficients were calculated from the HVSR technique which gave valuesranging from 0,7 to 4,3 while the calculated vulnerability coefficients from the Cross Spectrum and Power Spectrum technique resulted ranging from 0,1 to 4,8. In general, it was observed that there was an increase in magnification values at high frequencies in both methods. The points where the soil amplification and vulnerability values are high are important in terms of showing the areas with high risk of structural damage in the event of an earthquake that will affect the city center of Burdur.

Keywords

Microtremor, Cross Spectrum and Power Spectrum technique, effective frequency, amplification, vulnerability.

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