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An investigation of seismicity for western Anatolia

Author

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  • Nilgün Sayil
  • İlhan Osmanşahin

Abstract

In order to investigate the seismicity of western Anatolia limited with the coordinates of 36°–40° N, 26°–32° E, Gutenberg–Richter magnitude–frequency relation, seismic risk and recurrence period have been computed. The data belonging to both the historical period before 1900 (I 0 ≥ 5.0 corresponding to M S ≥ 4.4) and the instrumental period until the end of 2006 (M S ≥ 4.0) has been used in the analysis. The study area has been divided into 13 sub-regions due to certain seismotectonic characteristics, plate tectonic models and geology of the region. All the computations have been performed for these sub-regions, separately. According to the results, a and b values in the computed magnitude–frequency relations are in the intervals 3.19±0.17 – 5.15±0.52 and 0.42±0.05 – 0.66±0.07, respectively. The highest b values have been determined for sub-regions 3 and 12 (Demirci-Gediz and Gökova Gulf-Muğla-Gölhisar). The lowest b values have also been determined for sub-regions 1 and 9 (Balıkesir and Bodrum-İstanköy). Finally, seismic risk and recurrence period computations from a and b values have shown as expected that sub-regions 1 and 9 which have the lowest b values and the highest risks and the shortest-recurrence periods. Copyright Springer Science+Business Media B.V. 2008

Suggested Citation

  • Nilgün Sayil & İlhan Osmanşahin, 2008. "An investigation of seismicity for western Anatolia," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 44(1), pages 51-64, January.
    • Handle: RePEc:spr:nathaz:v:44:y:2008:i:1:p:51-64
    DOI: 10.1007/s11069-007-9141-2
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    Citations

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    Cited by:

    1. Nilgün Sayıl, 2013. "Long-term earthquake prediction in western Anatolia with the time- and magnitude-predictable model," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 66(2), pages 809-834, March.
    2. Mehmet Alpyürür & Musaffa Ayşen Lav, 2022. "An assessment of probabilistic seismic hazard for the cities in Southwest Turkey using historical and instrumental earthquake catalogs," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 114(1), pages 335-365, October.
    3. Nilgun Sayil & Ilhan Osmansahin, 2009. "Reply to Bayrak’s comments on “An investigation of seismicity for western anatolia” by Sayil and Osmanşahin (2008)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 50(1), pages 1-3, July.

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