Temporal variations in the fractal properties of seismicity in the north anatolian fault zone between 31°E and 41°E

Ali Osman Öncel*, Ian Main, Ömer Alptekin, Patience Cowie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the nature of temporal variations in the statistical properties of seismicity associated with the North Anatolian Fault Zone between longitudes 31°-41°E during the instrumental period 1900-1992. Temporal vanations in the seismic b value and the fractal (correlation) dimension Dc of earthquake epicenters are examined for earthquakes of magnitude Ms ≥ 4.5, using sliding windows of 100 consecutive events, b varies temporally between 0.6 and 1.0, and Dc between 0.6 and 1.4, both representing significant fluctuations above the errors in measurement technique. A strong negative correlation (r = -0.85) is observed between b and Dc, consistent with previous observation of seismicity in Japan and southern California. Major events early in this century (MS ≥ 7) are associated with low b and high Dc, respectively consistent with greater stress intensity and greater spatial clustering of epicenters - both implying a greater degree of stress concentration at this time.

Original languageEnglish
JournalPure and Applied Geophysics
Volume147
Issue number1
Publication statusPublished - 1 Dec 1996

Keywords

  • Fractal dimension
  • North anatolian fault zone
  • Seismicity

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