Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 2 2010 10.5194/nhess-10-203-2010 http://www.nat-hazards-earth-syst-sci.net/10/203/2010/ http://www.nat-hazards-earth-syst-sci.net/10/203/2010/nhess-10-203-2010.html http://www.nat-hazards-earth-syst-sci.net/10/203/2010/nhess-10-203-2010.pdf 203 214 2010-02-09 The 6 April 2009 earthquake at L'Aquila: a preliminary analysis of magnetic field measurements U. Villante umberto.villante@aquila.infn.it M. De Lauretis C. De Paulis P. Francia A. Piancatelli E. Pietropaolo M. Vellante A. Meloni P. Palangio K. Schwingenschuh G. Prattes W. Magnes P. Nenovski Dipartimento di Fisica, Università L'Aquila, L'Aquila, Italy Area di Ricerca in Astrogeofisica, L'Aquila, Italy Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy Institut für Weltraumforschung, Graz, Austria Geophysical Institute, Sofia, Bulgaria Several investigations reported the possible identification of anomalous geomagnetic field signals prior to earthquake occurrence. In the ULF frequency range, candidates for precursory signatures have been proposed in the increase in the noise background and polarization parameter (i.e. the ratio between the amplitude/power of the vertical component and that one of the horizontal component), in the changing characteristics of the slope of the power spectrum and fractal dimension, in the possible occurrence of short duration pulses. We conducted, with conventional techniques of data processing, a preliminary analysis of the magnetic field observations performed at L'Aquila during three months preceding the 6 April 2009 earthquake, focusing attention on the possible occurrence of features similar to those identified in previous events. Within the limits of this analysis, we do not find compelling evidence for any of the features which have been proposed as earthquake precursors: indeed, most of aspects of our observations (which, in some cases, appear consistent with previous findings) might be interpreted in terms of the general magnetospheric conditions and/or of different sources. Anzidei, M., Boschi, E., Cannelli, V., Devoti, R., Esposito, A., Galvani, A., Melini, D., Pietrantonio, G., Riguzzi, F., Sepe, V., and Serpelloni, E.: Coseismic deformation of the destructive April 6, 2009 L'Aquila earthquake (central Italy) from GPS data, Geophys. Res. Lett., 36, L17307, doi:10.1029/2009gl039145, 2009. 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