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Journal of Seismology

, Volume 21, Issue 1, pp 35–46 | Cite as

Local magnitude scale for earthquakes in Turkey

  • T. Kılıç
  • L. Ottemöller
  • J. Havskov
  • K. Yanık
  • Ö. Kılıçarslan
  • F. Alver
  • M. Özyazıcıoğlu
ORIGINAL ARTICLE

Abstract

Based on the earthquake event data accumulated by the Turkish National Seismic Network between 2007 and 2013, the local magnitude (Richter, Ml) scale is calibrated for Turkey and the close neighborhood. A total of 137 earthquakes (Mw > 3.5) are used for the Ml inversion for the whole country. Three Ml scales, whole country, East, and West Turkey, are developed, and the scales also include the station correction terms. Since the scales for the two parts of the country are very similar, it is concluded that a single Ml scale is suitable for the whole country. Available data indicate the new scale to suffer from saturation beyond magnitude 6.5. For this data set, the horizontal amplitudes are on average larger than vertical amplitudes by a factor of 1.8. The recommendation made is to measure Ml amplitudes on the vertical channels and then add the logarithm scale factor to have a measure of maximum amplitude on the horizontal. The new Ml is compared to Mw from EMSC, and there is almost a 1:1 relationship, indicating that the new scale gives reliable magnitudes for Turkey.

Keywords

Local (Richter) magnitude scale Magnitude calibration Wood-Anderson seismogram Horizontal vs vertical amplitude Geometrical spreading Seismic attenuation 

Notes

Acknowledgments

This research has been conducted as part of the project UDAP-Ç-12-15 titled “Calibration and Implementation of Earthquake Magnitude Scales for Turkish National Seismic Network,” National Earthquake Research Program, AFAD, Turkey, 2013.

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • T. Kılıç
    • 1
  • L. Ottemöller
    • 2
  • J. Havskov
    • 2
  • K. Yanık
    • 1
  • Ö. Kılıçarslan
    • 1
  • F. Alver
    • 1
  • M. Özyazıcıoğlu
    • 3
  1. 1.AFADAnkaraTurkey
  2. 2.Department of GeodynamicsUniversity of BergenBergenNorway
  3. 3.Atatürk UniversityAtatürkTurkey

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