Properties of the aftershocks sequences of the 2000 and 2002 earthquakes in Aksehir-Afyon graben, west-central Anatolia, Turkey

Naside Ozer (), Yildiz Altinok and Savas Ceylan

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2007, vol. 40, issue 3, 553-562

Abstract: The b-value of the Gutenberg–Richter’s frequency–magnitude relation and the p-value of the modified Omori law, which describes the decay rate of aftershock activity, were investigated for more than 500 aftershocks in the Aksehir-Afyon graben (AAG) following the 15 December 2000 Sultandagi–Aksehir and the 3 February 2002 Çay–Eber and Çobanlar earthquakes. We used the Kandilli Observatory’s catalog, which contains records of aftershocks with magnitudes ≥2.5. For the Çobanlar earthquake, the estimated b-values for three aftershock sequences are in the range 0.34 ≤ b ≤ 2.85, with the exception of the one that occurred during the first hour (4.77), while the obtained p-values are in the range 0.44 ≤ p ≤ 1.77. The aftershocks of the Sultandagi earthquake have a high p-value, indicating fast decay of the aftershock activity. A regular increase of b can be observed, with b > 1.0 after 0.208 days for the Çay–Eber earthquake. A systematic and similar increase and decrease pattern exists for the b- and p-values of the Çobanlar earthquakes during the first 5 days. Copyright Springer Science+Business Media B.V. 2007

Keywords: Aftershock decay; b-value; p-value; Seismic parameters; West central Anatolia (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1007/s11069-006-9019-8

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