Scaling features of ambient noise at different levels of local seismic activity: A case study for the Oni seismic station

Matcharashvili, T. and Chelidze, T. and Javakhishvili, Zurab and Jorjiashvili, N. and Zhukova, N. (2012) Scaling features of ambient noise at different levels of local seismic activity: A case study for the Oni seismic station. Acta Geophysica, 60 (3). pp. 809-832. ISSN 1895-6572 (print version); 1895-7455 (electronic version)

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Abstract

Investigation of dynamical features of ambient seismic noise is one of the important scientific and practical research challenges. We investigated scaling features of the ambient noises at the Oni seismic station, Georgia, using detrended fluctuation analysis method. Data from this seismic station, located in the epicentral zone of Oni M6.0, 2009, earthquake, were selected to include time periods with different levels of local seismic activity. It was shown that the investigated ambient noise is persistent long range correlated at calm seismic conditions in the absence of earthquakes. Fluctuation features of the analyzed ambient noises were affected by local earthquakes, while remote seismic activity caused just slight quantitative changes. Processes related to the preparation of a strong local earthquake may cause quantifiable changes in fluctuation features of ambient noises. Fluctuation features of seismic noise for periods of increased local seismic activity cease to be long-range correlated and appear to become a complicated mixture of random and correlated behaviours.

Item Type: Article
Subjects: Q Science > Geophysics
Divisions: Institutes > Institute of Earth Sciences
Depositing User: Professor Zurab Javakhishvili
Date Deposited: 06 Apr 2015 07:25
Last Modified: 06 Apr 2015 07:25
URI: http://eprints.iliauni.edu.ge/id/eprint/1867

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