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| Titel |
An Equivalent Moment Magnitude Earthquake Catalogue for Western Turkey and its Quantitative Properties |
| VerfasserIn |
Konstantinos Leptokaropoulos, Karakostas Vasilios, Eleftheria Papadimitriou, Adamaki Aggeliki, Tan Onur, Pabuçcu Zumer |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072404
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| Zusammenfassung |
| Abstract
Earthquake catalogues consist a basic product of seismology, resulting from complex
procedures and suffering from natural and man-made errors. The accumulation of these
problems over space and time lead to inhomogeneous catalogues which in turn lead to
significant uncertainties in many kinds of analyses, such as seismicity rate evaluation and
seismic hazard assessment. A major source of catalogue inhomogeneity is the variety of
magnitude scales (i.e. Mw, mb, MS, ML, Md), reported from different institutions and
sources. Therefore an effort is made in this study to compile a catalogue as homogenous as
possible regarding the magnitude scale for the region of Western Turkey (26oE – 32oE
longitude, 35oN – 43oN latitude), one of the most rapidly deforming regions worldwide with
intense seismic activity, complex fault systems and frequent strong earthquakes. For this
purpose we established new relationships to transform as many as possible available
magnitudes into equivalent moment magnitude scale, M*w. These relations yielded by
the application of the General Orthogonal Regression method and the statistical
significance of the results was quantified. The final equivalent moment magnitude was
evaluated by taking into consideration all the available magnitudes for which a
relation was obtained and also a weight inversely proportional to their standard
deviation. Once the catalogue was compiled the magnitude of completeness, Mc,
was investigated in both space and time regime. The b-values and their accuracy
were also calculated by the maximum likelihood estimate. The spatial and temporal
constraints were selected in respect to seismicity recording level, since the state and
evolution of the local and regional seismic networks are unknown. We modified
and applied the Goodness of Fit test of Wiemer and Wyss (2000) in order to be
more effective in datasets that are characterized by smaller sample size and higher
Mcthresholds. The compiled catalogue and the Mcevaluation technique introduced in
this study may constitute a useful tool for future seismicity research in Western
Turkey.
Acknowledgements: This work was partially supported by the research project titled as
“Seismotectonic properties of the eastern Aegean: Implications on the stress field evolution
and seismic hazard assessment in a tectonically complex area”, GSRT 10 T UR/ 1-3-9, Joint
Research and Technology Programmes 2010 – 2011, financed by the Ministry of Education of
Greece. |
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