Fractal approach of the temporal earthquake distribution in the Hellenic arc-trench system |
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Authors: | Gerassimos A. Papadopoulos Vassilis Dedousis |
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Affiliation: | (1) Section of Geology and Geophysics, Department of Civil Engineering, Hellenic Air Force Academy, Dekelia, Attika, Greece;(2) Department of Seismotectonics, Earthquake Planning and Protection Organization, 226 Messogion Ave., 15561 Holargos, Athens, Greece |
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Abstract: | The time clustering of earthquakes occurring in the Hellenic arc-trench system is quantitatively analyzed by means of the fractal dimension,D, of their time distribution in the time intervals of 1950–1985 (Ms>-4.5) and 1964–1985 (Ms4.0). The results obtained imply that scale-invariant clustering holds over very large scale lengths of time,T, with 22–28T (in min) 220–222, depending on the seismotectonic segment considered. In all segments a common feature is the relation between theD1,D2 andD3-values found for shallow, intermediate-depth and all-depth shocks, respectively:D3>D1>D2. TheD-values found for shallow shocks range between 0.137 and 0.191 with the exception of the Ionian Islands and Cretan segments where anomalously high values (D=0.221–0.251) have been determined. We discuss possible seismotectonic interpretations of the results. |
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Keywords: | Fractals earthquake clustering scale-invariant processes Hellenic Arc |
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