Araştırma Makalesi
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The Lateral Heterogeneity of Attenuation (1/QC) in Southeasternan Anatolia

Yıl 2020, Sayı: 18, 850 - 857, 15.04.2020
https://doi.org/10.31590/ejosat.672557

Öz

In this study, possible adaptations and inadaptations between the coda quality factor and seismic activity, tectonic discontinuity and lithospheric heterogeneity were attempted to be determined. For this purpose, Sg waves obtained from Kemaliye, Diyarbakır and Erzurum seismic stations, which are on different tectonic systems and whose seismic activities are different from one another, have been used. In these three areas under the influence of different fault zones, the lateral code quality factor (QC) and attenuation values (1/QC) and frequency dependence (η) lateral chance of the shallow crust have been determined and analyzed comparatively. The single isotropic scattering method has been used to obtain Qc and η values in the study. The lowest coda value Q1=(82±5) was obtained from Kemaliye station, the highest value Q2=(90±5) was obtained from Diyarbakır station and Q3 = (86±3) value was obtained from Erzurum station. The highest attenuation values were obtained at Kemaliye station, while the lowest attenuation values were obtained at Erzurum station. The highest η values were obtained from Kemaliye seismic station data as 0.96∓0.04 and the lowest η value was obtained from Diyarbakır station records as 0.85±0.03. The value for Erzurum station η was obtained as 0.88∓0.02. Coda values were obtained in the range of 82 and 90 and frequency dependence values 0.66 and 1.27. The 1/QC and frequency dependence values of the three regions range from 0.001 to 0.014, showing regional differences in the seismotectonic activity of the crust. The fact that the lateral attenuation values of Kemaliye region were found to be quite different from the regions of Erzurum and Diyarbakir was supported by the fact that this region was tectonically more active than the other two regions. New information has been obtained for coda and frequency dependence values of the three stations and three different seismic regimes and lithospheric crustal structure in the region.

Kaynakça

  • Aki, K. (1969). Analysis of the seismic coda of local earthquakes as scattered waves. Journal of geophysical research, 74(2), 615-631.
  • Aki, K. (2004). A new view of earthquake and volcano precursors. Earth, planets and space, 56(8), 689-713.
  • Aki, K., & Chouet, B. (1975). Origin of coda waves: source, attenuation, and scattering effects. Journal of geophysical research, 80(23), 3322-3342.
  • Aydın, U. (2015). Estimation of seismodynamics differences and lateral variations of coda Q in Eastern Anatolia. Arabian Journal of Geosciences, 8(8), 6363-6370.
  • Aydin, U., & Şahin, Ş. (2011). Comparison of the attenuation properties for two different areas in eastern Anatolia, Turkey. Soil Dynamics and Earthquake Engineering, 31(8), 1192-1195.
  • Bozkurt, E. (2001). Neotectonics of Turkey–a synthesis. Geodinamica acta, 14(1-3), 3-30.
  • Eyidoğan, H., Akıncı, A., Gündoğdu, O., Polat, O., & Kaypak, B. (1996). Investigation of the recebt seismic activity of Gökova Basin. Paper presented at the National Marine Geology and Geophysical Programme Workshop I, Proceedings.
  • Giampiccolo, E., Gresta, S., & Rascona, F. (2004). Intrinsic and scattering attenuation from observed seismic codas in southeastern Sicily (Italy). Physics of the Earth and Planetary Interiors, 145(1-4), 55-66.
  • Jin, A., & Aki, K. (1988). Spatial and temporal correlation between coda Q and seismicity in China. Bulletin of the Seismological Society of America, 78(2), 741-769.
  • Johnston, D., & Toksöz, M. (1981). Definitions and terminology: Seismic Wave Attenuation, Geophysics reprint series no. 2. Society of Exploration Geophysicists, Tulsa.
  • Knopoff, L. (1964). Department of Physics and Institute of Geophysics and Planetary Physics University of California, Los Angeles. Rev Geophys, 2(4), 625-660.
  • Knopoff, L. (1964). Q Rev. Geophysics, 2, 625-660.
  • Mak, S., Chan, L., Chandler, A., & Koo, R. (2004). Coda Q estimates in the Hong Kong region. Journal of Asian Earth Sciences, 24(1), 127-136.
  • Rautian, T., & Khalturin, V. (1978). The use of the coda for determination of the earthquake source spectrum. Bulletin of the Seismological Society of America, 68(4), 923-948.
  • Romanowicz, B., & Mitchell, B. J. (2012). Q of the earth: Global, regional, and laboratory studies: Birkhäuser.
  • Sato, H. (1977). Energy propagation including scattering effects sengle isotropic scattering approximation. Journal of Physics of the Earth, 25(1), 27-41.
  • Sato, H., Fehler, M. C., & Maeda, T. (2012). Seismic wave propagation and scattering in the heterogeneous earth (Vol. 496): Springer.
  • Sertçelik, F. (2012). Estimation of coda wave attenuation in the east Anatolia fault zone, Turkey. Pure and applied geophysics, 169(7), 1189-1204.
  • Singh, S., & Herrmann, R. B. (1983). Regionalization of crustal coda Q in the continental United States. Journal of Geophysical Research: Solid Earth, 88(B1), 527-538.

Güney ve Doğu Anadolu’ da Soğurulmanın (1/QC) Yanal Heterojenitesi

Yıl 2020, Sayı: 18, 850 - 857, 15.04.2020
https://doi.org/10.31590/ejosat.672557

Öz

Sismik soğrulma ve saçılma kabukta bulunan tektonik süreksizliklerin ve diğer birçok faktörün kontrolünde bölgesel değişimler göstermektedir. Bu çalışma tektonik rejim açısından birebirinden farklı olan Kemaliye, Diyarbakır ve Erzurum sismik istasyonlarından elde edilen sekonder kütle dalgalarının koda kalite faktörü ve soğrulma değerleri ile frekans bağımlılıkları değişimlerinin tektonik yapı ve sismisiteyle karşılaştırılması amaçlanmıştır. Birbirinden farklı fay zonlarının etkisi altındaki bu üç alanda yakın kabuğa ait yanal koda kalite faktörü (QC) ve soğrulma değerleri (1/QC) ile frekans bağımlılıkları (η) tomografileri belirlenerek karşılaştırmalı olarak incelenmiştir. Çalışmada Aki tarafından kullanılan ve Sato tarafından geliştirilen tek izotropik saçılma yöntemi kullanılmıştır. En düşük koda Q1=(82±5) değeri Kemaliye istasyonundan, en yüksek Q2=(90±5) değeri Diyarbakır istasyonundan ve Q3=(86±3) değeri de Erzurum istasyonundan elde edilmiştir. En yüksek soğurma değerleri Kemaliye istasyonunda elde edilirken en düşük soğurma değerleri Erzurum istasyonundan elde edilmiştir. En yüksek frekans bağımlılığı değerleri f 0.96∓0.04 olarak Kemaliye sismik istasyonu verilerinden en düşük f 0.85±0.03 olarak Diyarbakır istasyonu kayıtlarından elde edilmiştir. Erzurum istasyonu için ise f 0.88∓0.02 olarak elde edilmiştir. Koda değerleri 82 ve 90, frekans bağımlılığı değerleri 0.66 ve 1.27 aralığında elde edilmiştir. Üç bölgenin 1/QC ve frekans bağımlılığı değerleri, kabuğun sismotektonik aktivitesindeki bölgesel farklılıklara bağlı olarak 0.001-0.014 arasında değişmektedir. Kemaliye’ye ait yanal soğrulma değerlerinin Erzurum ve Diyarbakır bölgelerinden oldukça farklı bulunmuş olması bu bölgenin tektonik olarak diğer iki bölgeden daha aktif olduğu gerçeği ile desteklenmiştir. Düşük Qc ve yüksek frekans bağımlılık değerleri Kemaliye'de elde edilmiş ve bu da tüm bölgelerde en yüksek tektonik aktiviteye sahip olduğunu göstermektedir. Çalışmadan elde edilen bulgular üç bölgeye ait sismisite ve tektonik yapı ile uyumludur. Üç istasyona ait Koda ve frekans bağımlılığı değerleri bölgede bulunan büyük tektonik süreksizlikler ve litosferik kabuk yapısı ile ilgili bilgiler vermiştir.

Kaynakça

  • Aki, K. (1969). Analysis of the seismic coda of local earthquakes as scattered waves. Journal of geophysical research, 74(2), 615-631.
  • Aki, K. (2004). A new view of earthquake and volcano precursors. Earth, planets and space, 56(8), 689-713.
  • Aki, K., & Chouet, B. (1975). Origin of coda waves: source, attenuation, and scattering effects. Journal of geophysical research, 80(23), 3322-3342.
  • Aydın, U. (2015). Estimation of seismodynamics differences and lateral variations of coda Q in Eastern Anatolia. Arabian Journal of Geosciences, 8(8), 6363-6370.
  • Aydin, U., & Şahin, Ş. (2011). Comparison of the attenuation properties for two different areas in eastern Anatolia, Turkey. Soil Dynamics and Earthquake Engineering, 31(8), 1192-1195.
  • Bozkurt, E. (2001). Neotectonics of Turkey–a synthesis. Geodinamica acta, 14(1-3), 3-30.
  • Eyidoğan, H., Akıncı, A., Gündoğdu, O., Polat, O., & Kaypak, B. (1996). Investigation of the recebt seismic activity of Gökova Basin. Paper presented at the National Marine Geology and Geophysical Programme Workshop I, Proceedings.
  • Giampiccolo, E., Gresta, S., & Rascona, F. (2004). Intrinsic and scattering attenuation from observed seismic codas in southeastern Sicily (Italy). Physics of the Earth and Planetary Interiors, 145(1-4), 55-66.
  • Jin, A., & Aki, K. (1988). Spatial and temporal correlation between coda Q and seismicity in China. Bulletin of the Seismological Society of America, 78(2), 741-769.
  • Johnston, D., & Toksöz, M. (1981). Definitions and terminology: Seismic Wave Attenuation, Geophysics reprint series no. 2. Society of Exploration Geophysicists, Tulsa.
  • Knopoff, L. (1964). Department of Physics and Institute of Geophysics and Planetary Physics University of California, Los Angeles. Rev Geophys, 2(4), 625-660.
  • Knopoff, L. (1964). Q Rev. Geophysics, 2, 625-660.
  • Mak, S., Chan, L., Chandler, A., & Koo, R. (2004). Coda Q estimates in the Hong Kong region. Journal of Asian Earth Sciences, 24(1), 127-136.
  • Rautian, T., & Khalturin, V. (1978). The use of the coda for determination of the earthquake source spectrum. Bulletin of the Seismological Society of America, 68(4), 923-948.
  • Romanowicz, B., & Mitchell, B. J. (2012). Q of the earth: Global, regional, and laboratory studies: Birkhäuser.
  • Sato, H. (1977). Energy propagation including scattering effects sengle isotropic scattering approximation. Journal of Physics of the Earth, 25(1), 27-41.
  • Sato, H., Fehler, M. C., & Maeda, T. (2012). Seismic wave propagation and scattering in the heterogeneous earth (Vol. 496): Springer.
  • Sertçelik, F. (2012). Estimation of coda wave attenuation in the east Anatolia fault zone, Turkey. Pure and applied geophysics, 169(7), 1189-1204.
  • Singh, S., & Herrmann, R. B. (1983). Regionalization of crustal coda Q in the continental United States. Journal of Geophysical Research: Solid Earth, 88(B1), 527-538.
Toplam 19 adet kaynakça vardır.

Ayrıntılar

Birincil Dil Türkçe
Konular Mühendislik
Bölüm Makaleler
Yazarlar

Ufuk Aydın 0000-0001-7981-9550

Yayımlanma Tarihi 15 Nisan 2020
Yayımlandığı Sayı Yıl 2020 Sayı: 18

Kaynak Göster

APA Aydın, U. (2020). Güney ve Doğu Anadolu’ da Soğurulmanın (1/QC) Yanal Heterojenitesi. Avrupa Bilim Ve Teknoloji Dergisi(18), 850-857. https://doi.org/10.31590/ejosat.672557