Analysis of temporal variation of earthquake occurrences in Caucasus from 1960 to 2011

Matcharashvili, T. and Telesca, I. and Cheloidze, T. and Javakhishvili, Zurab and Zhukova, N. (2013) Analysis of temporal variation of earthquake occurrences in Caucasus from 1960 to 2011. Tectonophysics, 608. pp. 857-865. ISSN 0040-1951

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Abstract

Frequency of earthquake occurrences in Caucasus is investigated on hourly and daily timescales. The observation period is 51 years, which is sufficiently long to perform a reliable statistics. Several methods (power spectrum, wavelet and Hilbert–Huang transformation) are applied to earthquake time series. Our findings show that earthquakes hourly and daily occurrence is not characterized by the dominant frequencies. However, many different oscillations with periods from hours to years and longer contribute to the frequency content of the earthquake time distribution, although their amplitude is rather low. The variation of the power of cyclic components in the temporal features of earthquakes occurrence is not uniform, but their amplification corresponds to the decrease of released local seismic energy.

Item Type: Article
Subjects: Q Science > Geophysics
Q Science
Divisions: Institutes > Institute of Earth Sciences
Depositing User: Professor Zurab Javakhishvili
Date Deposited: 06 Apr 2015 07:26
Last Modified: 06 Apr 2015 07:26
URI: http://eprints.iliauni.edu.ge/id/eprint/1866

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