Publikationsdatum:
2017-04-04
Beschreibung:
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.
Beschreibung:
Published
Beschreibung:
1197-1208
Beschreibung:
1.7. Osservazioni di alta e media atmosfera
Beschreibung:
3.1. Fisica dei terremoti
Beschreibung:
3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
Beschreibung:
JCR Journal
Beschreibung:
open
Schlagwort(e):
ionospheric transient
;
ionogram
;
earthquake
;
acoustic gravity wave
;
01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous
;
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
;
01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques
;
04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
;
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
article
