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| Titel |
Variability of sporadic E-layer semi transparency (foEs-fbEs)with magnitude and distance from earthquake epicenters to vertical sounding stations |
| VerfasserIn |
E. V. Liperovskaya, O. A. Pokhotelov, Y. Hobara, M. Parrot |
| 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 ; 3, no. 3/4 ; Nr. 3, no. 3/4, S.279-284 |
| Datensatznummer |
250000688
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| Publikation (Nr.) |
 copernicus.org/nhess-3-279-2003.pdf |
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| Zusammenfassung |
| Variations of the Es-layer
semi transparency co-efficient were analyzed for more than 100 earthquakes
with magnitudes M > 4 and depths h < 100 km. Data of mid latitude
vertical sounding stations (Kokubunji, Akita, and Yam-agawa) have been
used for several decades before and after earthquake occurrences. The
semi-transparency coefficient of Es-layer X = (foEs
– fbEs)/fbEs can characterize,
for thin layers, the presence of small scale plasma turbulence. It is
shown that the turbulence level decreases by ~ 10% during three days
before earthquakes probably due to the heating of the atmosphere. On the
contrary, the turbulence level increases by the same value from one to
three days after the shocks. For earthquakes with magnitudes M > 5 the
effect exists at distances up to 300 km from the epicenters. The effect
could also exist for weak (M ~ 4) and shallow (depth < 50 km)
earthquakes at a distance smaller than 200 km from the epicenters. |
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