Magnitude conversion problem for the Turkish earthquake data |
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| Authors: | Aykut Deniz M Semih Yucemen |
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| Institution: | (1) Technological Engineering Services Co. Ltd, PO Box 45, Aksu, Antalya, 07110, Turkey;(2) Department of Earthquake Studies, Middle East Technical University, Ankara, 06531, Turkey; |
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| Abstract: | Earthquake catalogues which form the main input in seismic hazard analysis generally report earthquake magnitudes in different
scales. Magnitudes reported in different scales have to be converted to a common scale while compiling a seismic data base
to be utilized in seismic hazard analysis. This study aims at developing empirical relationships to convert earthquake magnitudes
reported in different scales, namely, surface wave magnitude, M
S, local magnitude, M
L, body wave magnitude, m
b and duration magnitude, M
d, to the moment magnitude (M
w). For this purpose, an earthquake data catalogue is compiled from domestic and international data bases for the earthquakes
occurred in Turkey. The earthquake reporting differences of various data sources are assessed. Conversion relationships are
established between the same earthquake magnitude scale of different data sources and different earthquake magnitude scales.
Appropriate statistical methods are employed iteratively, considering the random errors both in the independent and dependent
variables. The results are found to be sensitive to the choice of the analysis methods. |
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