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Spectral determination of source parameters in the Marmara Region

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Abstract

Ever since the 1999 Kocaeli earthquake, in which the Kandilli Observatory and Earthquake Research Institute (KOERI) was not able to correctly reflect the magnitude size in its preliminary report because of the saturation effect, a rapid and accurate determination of the earthquake becomes a very important issue. Therefore, in the framework of this study, an automatic determination of the moment magnitude was performed by using the displacement spectra of selected earthquakes in the Marmara Region. For this purpose, 39 three-component broadband stations from KOERI seismic network which recorded 174 earthquakes with magnitudes 2.5 ≤ M ≤ 5.0 in between 2006–2009 were used. Due to the importance of quality factor in determination of the moment magnitude with spectral analysis method, the quality factor was calculated for the whole region in the beginning. Source spectrum which was obtained by converting the velocity records to displacement spectra and moment magnitudes of earthquakes were determined by fitting this spectrum to classical Brune model. For this aim, an automatic procedure was utilized which based on minimizing the differences between observed and synthetic source spectra identified by the S waves. Besides moment magnitude and location parameters, some source parameters such as seismic moment, spectral level, corner frequency and stress drop were also calculated. Application of the method proves that determining the seismic moment from the source spectra is applicable not only for earthquakes with small magnitude but also moderate earthquakes as well.

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Acknowledgments

The authors would like to thank the KOERI-NEMC staff for providing waveform data. This work was performed under the auspices of the director of the NEMC, Dogan Kalafat. Constructive comments that were leading to improvement of the study and guides to modifications of graphic representations by Mehmet Yılmazer is kindly appreciated. It is a pleasure to acknowledge valuable suggestions we have had with Jens Havskov concerning many aspects of the study. The guidance during the preparation of the manuscript of Ethem Görgün is appreciated.

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Authors and Affiliations

  1. Kandilli Observatory and Earthquake Research Institute, Boğaziçi University, Çengelköy, Istanbul, Turkey

    A. Köseoğlu, N. M. Özel & S. B. Üçer

  2. Department of Geophysics, Kocaeli University, Izmit, Turkey

    Ş. Barış

  3. Department of Earth Science, University of Bergen, Bergen, Norway

    L. Ottemöller

Authors
  1. A. Köseoğlu
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  2. N. M. Özel
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  3. Ş. Barış
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  4. S. B. Üçer
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  5. L. Ottemöller
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Correspondence to A. Köseoğlu.

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Köseoğlu, A., Özel, N.M., Barış, Ş. et al. Spectral determination of source parameters in the Marmara Region. J Seismol 18, 651–669 (2014). https://doi.org/10.1007/s10950-014-9435-2

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  • DOI: https://doi.org/10.1007/s10950-014-9435-2

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