Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 8 1 2008 10.5194/nhess-8-109-2008 http://www.nat-hazards-earth-syst-sci.net/8/109/2008/ http://www.nat-hazards-earth-syst-sci.net/8/109/2008/nhess-8-109-2008.html http://www.nat-hazards-earth-syst-sci.net/8/109/2008/nhess-8-109-2008.pdf 109 122 2008-02-21 Seismicity assessment for the different regions in and around Turkey based on instrumental data: Gumbel first asymptotic distribution and Gutenberg-Richter cumulative frequency law Y. Bayrak bayrak@ktu.edu.tr S. Öztürk G. Ch. Koravos G. A. Leventakis T. M. Tsapanos Karadeniz Technical University, Department of Geophysics, 61080 Trabzon, Turkey Aristotle University of Thessaloniki, School of Geology, Geophysical Laboratory, 54124, Thessaloniki, Greece The evaluation of the seismicity in 24 seismic regions, in which Turkey and adjacent areas divided, is carried out. For this purpose two methods are adopted. The first is the "whole process" which follows the Gutenberg and Richter distribution frequency-magnitude law, while the second one is the "part process" which is well known as the theory of extreme values. This theory was developed by Gumbel in order to solve many geophysical problems. The first asymptotic distribution of extremes was used in the present study. The advantage of the method is that it does not required analysis of the whole data set. It uses, instead, the sequence of earthquakes with the largest magnitudes in a set of predetermined equal-time intervals. The parameters a and b were estimated from both methods. For the goodness of fit, to the Gutenberg-Richter frequency-magnitude law, the maximum likelihood approach is applied. The b-values calculated from Gutenberg and Richter frequency-magnitude law, reveal a better fit to the tectonic environment of the 24 seismic regions of Turkey and its surroundings examining in this study. 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