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- Title
Daytime variations of foE connected to earthquakes.
- Authors
Liperovskaya, E. V.; Bogdanov, V. V.; Biagi, P.-F.; Meister, C.-V.; Liperovsky, V. A.; Contadakis, M. E.; Rodkin, M.
- Abstract
In the present work it is shown that, in accordance with the observations of the vertical sounding station "Tashkent", the critical foE-frequency of the daytime E-layer increases about one day before winter-earthquakes with magnitudes M > 5 and depths of the epicentre of h < 60 km, which appeared at distances of R < 2000 km from the station. The reliability of the result is larger than 99 %. The phenomenon is not observed for summer-earthquakes. It seems to be determined by the atmospheric wind system. Further, the variations of the foE-frequency are compared with possible simultaneous variations of the critical frequency foF2 of the F2-layer. First results show that only very large changes of the ionisation density in the E-layer influence the ionisation density in the F-region. Therefore, no synchronous growth of the foE- and foF2-frequencies 1-2 days before seismic shocks could be observed.
- Subjects
EARTHQUAKE magnitude measurement; ATMOSPHERIC ionization; F region; DIURNAL variations in meteorology; SEISMOLOGY; CLIMATE change; EARTH sciences
- Publication
Natural Hazards & Earth System Sciences, 2011, Vol 11, Issue 6, p1807
- ISSN
1561-8633
- Publication type
Article
- DOI
10.5194/nhess-11-1807-2011