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| Titel |
Analysis of ionospheric plasma perturbations before Wenchuan earthquake |
| VerfasserIn |
X. Zhang, X. Shen, J. Liu, X. Ouyang, J. Qian, S. Zhao |
| 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 ; 9, no. 4 ; Nr. 9, no. 4 (2009-07-28), S.1259-1266 |
| Datensatznummer |
250006889
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1259-2009.pdf |
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| Zusammenfassung |
| Based on data recorded by the French DEMETER satellite,
plasma perturbations have been analyzed before the Wenchuan 8.0 earthquake
which occurred on 12 May 2008. Using the revisited orbits, the seasonal
variations of the O+ density at daytime and nighttime were obtained
respectively. There mainly exist two kinds of shapes of O+ density,
with peak values in the Northern Hemisphere during May to September and
reversely in the Southern Hemisphere during other months. Analysis on local
daytime O+ density showed that it reached its lowest values 3 days
prior to the earthquake, i.e. on 9 May. With studies in more than 3 month
time series and comparison with those in 2006 and 2007, it was found that
the significant decrease of the O+ density on 9 May 2008 was different
from the trend variations of 2007 and 2006 both with relatively higher
O+ density in May. In addition, the ion density and temperature was
also analyzed before the earthquake at local nighttime. They showed smallest
value in O+ density and fast and short-term variations in ion
temperature on 9 May above the epicenter area. All these plasma anomalies
may be related to the Wenchuan earthquake. Finally, using our results and
those published in other papers, the possible mechanisms of these
ionospheric anomalies were discussed. |
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