Frequency Dependent Attenuation Characteristics of Body Waves in Büyük Menderes Graben

Year 2019, Volume: 5 Issue: 1, 116 - 123, 31.01.2019

Alper Demirci , Tolga Bekler

https://doi.org/10.21324/dacd.449551

Abstract

In this study, 66 earthquake data, along the faults of northern boundary of
the Büyük Menderes Graben and their continuations in the Aegean Sea, were used
to reveal the body wave attenuation characterization of the region. The
attenuation functions of the P and S waves are calculated by the coda
normalization technique. The results obtained in this study reveal attenuation
relations, which are one of the basic parameters required to modelling large
earthquakes in the region and to obtain more reliable results from necessary
seismic risk studies. The power-law functions were obtained for the S and P
seismic phases as Q_s=79.2±14.6f ^0.9±0.07 and Q_p=32.9±13.7f^1.05±0.16
respectively. Also the QS / QP ratio is calculated as ~ 1.75. for the
frequencies greater than 1 Hz. According to the results, the low Qp and Qs
values ​​and their ratios (QS / QP) indicate the abundance of scattering
effect, which can be interpreted as a result of intense lateral heterogeneity
in the upper crust.

Keywords

Attenuation , Büyük Menderes Graben , Earthquake , P Wave , S Wave

Büyük Menderes Grabeninde Cisim Dalgalarının Frekans Bağımlı Soğrulma Karakterinin Belirlenmesi

Abstract

Bu çalışmada,
Büyük Menderes grabeninin kuzey sınırı boyunca gelişen fay toplulukları ve
bunların Ege Denizi’ne doğru uzantıları boyunca oluşmuş 66 deprem verisi
kullanılarak bölgeye ait soğrulma karakteristikleri ortaya konmaktadır.
Çalışmada, P ve S dalgalarının soğrulma fonksiyonları, koda normalizasyon
tekniği ile hesaplanmıştır. Çalışma
kapsamında elde edilen sonuçlar, bölgede veya yakın civarında gelecekte olması
muhtemel büyük depremlerin daha doğru bir şekilde modellenebilmesi ve sismik
risk çalışmalarının da daha güvenilir sonuçlar elde edilmesi için gerekli olan
temel parametrelerden biri olan sönüm ilişkilerini ortaya koymaktadır.  Buna göre, S ve P sismik fazları için
sırasıyla, Q_s=79.2±14.6f ^0.9±0.07 ve Q_p=32.9±13.7f^1.05±0.16
fonksiyonları elde edilmiştir. Ayrıca 1 Hz’ den büyük frekanslarda Q_S/Q_P
oranı ortalama ~1.75 olarak hesaplanmıştır. Elde edilen sonuçlara göre düşük Qp
ve Qs değerleri ve bunların oranları (Q_S/Q_P) saçılma
etkisinin fazlalığını işaret etmekte ve bunun da çalışma alanındaki özellikle üst
kabuktaki yoğun yanal heterojenitenin bir sonucu olduğu şeklinde
yorumlanabilmektedir.

Keywords

Soğrulma , Büyük Menderes Grabeni , Deprem , P Dalgası , S Dalgası

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