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| Titel |
Ionospheric transients observed at mid-latitudes prior to earthquake activity in Central Italy |
| VerfasserIn |
P. Nenovski, Ch. Spassov, M. Pezzopane, U. Villante, M. Vellante, M. Serafimova |
| 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. 6 ; Nr. 10, no. 6 (2010-06-17), S.1197-1208 |
| Datensatznummer |
250008227
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1197-2010.pdf |
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| Zusammenfassung |
| Ionograms from Rome (41.8N, 12.5E) and Sofia (42.4N, 23.2E) ionospheric
stations during earthquake (EQ) activity with magnitude (M) between 5 and 6
in Central Italy are analyzed. It is found that several ionospheric
disturbances occur in the intermediate E-F region before the EQ shock. In
fact, besides sporadic E (Es) layer development (of type h) of short duration
(transients), fmin increase, trace gaps near the critical frequencies, and E
region trace disappearance are also observed within one to three hours before
the EQ shock. Before the EQ shocks we find that the F2 region parameters are
practically undisturbed. The only exception is the so-called fork trace that
appears mostly near the critical frequency of the F2 region. Acoustic gravity
waves (AGW) are suggested as one of the possible sources of transients
observed in the ionosphere before the EQ shock. |
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