Local magnitude scale for earthquakes in Turkey

KILIC T., Ottemöller L., Havskov J., YANIK K., KILICARSLAN O., ALVER F., ...Daha Fazla

JOURNAL OF SEISMOLOGY, cilt.21, sa.1, ss.35-46, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 21 Sayı: 1
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1007/s10950-016-9581-9
  • Dergi Adı: JOURNAL OF SEISMOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.35-46
  • Anahtar Kelimeler: Local (Richter) magnitude scale, Magnitude calibration, Wood-Andersonseismogram, Horizontal vs vertical amplitude, Geometrical spreading, Seismic attenuation, ML SCALE, NORTHWESTERN TURKEY, CALIBRATION, MOMENT
  • Atatürk Üniversitesi Adresli: Evet

Özet

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.