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| Titel |
Seismicity assessment for the different regions in and around Turkey based on instrumental data: Gumbel first asymptotic distribution and Gutenberg-Richter cumulative frequency law |
| VerfasserIn |
Y. Bayrak, S. Öztürk, G. Ch. Koravos, G. A. Leventakis, T. M. Tsapanos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 1 ; Nr. 8, no. 1 (2008-02-21), S.109-122 |
| Datensatznummer |
250005325
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| Publikation (Nr.) |
 copernicus.org/nhess-8-109-2008.pdf |
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| Zusammenfassung |
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. On the other hand b-values evaluated
from Gumbel's first distribution, do not adjust to the particular tectonics
of the 24 seismic regions. The modal value a1/b adopted from
Gutenberg-Richter for the 24 seismic regions were calculated, as well.
An effort made to correlate the tectonics of the area with the spatial
distribution of the various computed seismic parameter, while maps were
produced for this purpose. These maps provide a detail image of seismicity
and local tectonics for the whole investigated area. The results showed that
the Aegean arc and the North Anatolian fault zone ranked among to the first
positions between the 24 seismic regions researched. |
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