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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 5, issue 4
Nat. Hazards Earth Syst. Sci., 5, 555–559, 2005
https://doi.org/10.5194/nhess-5-555-2005
© Author(s) 2005. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Seismic hazard evaluation, precursory phenomena and seismo...

Nat. Hazards Earth Syst. Sci., 5, 555–559, 2005
https://doi.org/10.5194/nhess-5-555-2005
© Author(s) 2005. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  29 Jul 2005

29 Jul 2005

Multifractality in local geomagnetic field at Etna volcano, Sicily (southern Italy)

G. Currenti1, C. del Negro1, V. Lapenna2, and L. Telesca2 G. Currenti et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
  • 2Instituto di Metodologie per l’Analisi Ambientale,CNR, C. da S. Loja, 85050 Tito (PZ), Italy

Abstract. We applied the Multifractal Detrended Fluctuation Analysis (MF-DFA), which allows to detect multifractality in nonstationary signals, to the hourly means of local geomagnetic field recorded at Mt. Etna volcano (southern Italy). We studied the signal measured at one geomagnetic station, installed at the summit of volcano, which was characterized by a strong eruption on 27 October 2002. We analyzed two frames of signals, one measured before the eruption and the other after, in order to evaluate dynamical changes induced by the eruptive event. Our findings show that: i) the geomagnetic time series is multifractal; ii) the multifractal degree of the signal decreases after the occurrence of eruption. This study aims to propose another approach to investigate the complex dynamics of volcano-related geomagnetic field.

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