Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
203-214
Description:
1.6. Osservazioni di geomagnetismo
Description:
2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
Description:
3.4. Geomagnetismo
Description:
JCR Journal
Description:
open
Keywords:
magnetic field measurements
;
L'Aquila earthquake
;
01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics
;
04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous
;
04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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