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| Titel |
A qualitative study of the seismo-ionospheric precursors prior to the 6 April 2009 earthquake in L'Aquila, Italy |
| VerfasserIn |
G. S. Tsolis, T. D. Xenos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-22), S.133-137 |
| Datensatznummer |
250007883
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| Publikation (Nr.) |
 copernicus.org/nhess-10-133-2010.pdf |
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| Zusammenfassung |
| In this paper we use the Cross Correlation analysis method in conjunction
with the Empirical Mode Decomposition to analyze foF2 signals collected from
Rome, Athens and San Vito ionospheric stations, in order to verify the
existence of seismo-ionospheric precursors prior to M=6.3 L'Aquila
earthquake in Italy. The adaptive nature of EMD allows for removing the
geophysical noise from the foF2 signals, and then to calculate the
correlation coefficient between them. According to the cross correlation
coefficient theory, we expect the stations which located inside the
earthquake preparation area, as evaluated using Dobrovolsky equation, to
capture the ionospheric disturbances generated by the seismic event. On the
other hand the stations outside of this area are expected to remain
unaffected. The results of our study are in accordance with the theoretical
model, evidencing ionospheric modification prior to L'Aquila earthquake in a
certain area around the epicenter. However, it was found that the selection
of stations at the limits of the theoretically estimated earthquake
preparation area is not the best choice when the cross correlation method is
applied, since the modification of the ionosphere over these stations may not
be enough for the ionospheric precursors to appear. Our experimental results
also show that when a seismic event constitutes the main shock after a series
of pre-seismic activity, precursors may appear as early as 22 days prior to
the event. |
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