Scaling characteristics of SEGMA magnetic field data around the Mw 6.3 Aquila earthquake

• Autorzy: Nenovski P. , Chamati M. , Villante U. , De Lauretis M. , Francia P.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

detrended fluctuation analysis (DFA); magnetic field data; ultra low frequency (ULF); pulse activity; polarization; earthquake

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2013
• Tom: Vol. 61, no. 2
• Strony: 311--337
• Opis fizyczny: Bibliogr. 70 poz.

Twórcy

autor

Nenovski P.

autor

Chamati M.

autor

Villante U.

autor

De Lauretis M.

autor

Francia P.

• National Institute for Geophysics, Geodesy and Geography, Sofia, Bulgaria,

Bibliografia

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