Journal : Acta Geophysica
Article : Scaling characteristics of SEGMA magnetic field data around the Mw 6.3 Aquila earthquake

Authors :
Vitkulin, A. V.
Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, Petropavlovsk-Kamchatski, Russia, vik@kscnet.ru,
Semenov, V. Y.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, sem@igf.edu.pl,
Majewski, E.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, emaj@igf.edu.pl,
Nenovski, P.
National Institute for Geophysics, Geodesy and Geography, Sofia, Bulgaria, nenovski@geophys.bas.bg,
Abstract : We apply detrended fluctuation analysis (DFA) on fluxgate and search-coil data in ULF range (scales 10-90 s or 0.1-0.011 Hz) for the months January-April 2009 available from the South European GeoMagnetic Array stations: Castello Tesino (CST), Ranchio (RNC), and L’Aquila (AQU) in Italy; Nagycenk (NCK) in Hungary; and Panagyuriste (PAG) in Bulgaria. DFA is a data processing method that allows for the detection of scaling behaviors in observational time series even in the presence of non-stationarities. The H and Z magnetic field components at night hours (00-03 UT, 01-04 LT) and their variations at the stations CST, AQU, NCK, and PAG have been examined and their scaling characteristics are analyzed depending on geomagnetic and local conditions. As expected, the scaling exponen ts are found to increase when the Kp index increases, indicating a good correlation with geomagnetic activity. The scaling exponent reveals also local changes (at L’Aquila), which include an increase for the Z (vertical) component, followed by a considerable decrease for the X (horizontal) component in the midst of February 2009. Attempts are made to explain this unique feature with artificial and/or natural sources including the enhanced earthquake activity in the months January-April 2009 at the L’Aquila district.

Keywords : detrended fluctuation analysis (DFA), magnetic field data, ultra low frequency (ULF), pulse activity, polarization, earthquake,
Publishing house : Instytut Geofizyki PAN
Publication date : 2013
Number : Vol. 61, no. 2
Page : 311 – 337

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DOI :
Qute : Vitkulin, A. V. ,Semenov, V. Y. ,Majewski, E. ,Nenovski, P. ,Nenovski, P. , Scaling characteristics of SEGMA magnetic field data around the Mw 6.3 Aquila earthquake. Acta Geophysica Vol. 61, no. 2/2013
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