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| Titel |
Response of the ionospheric electron density to different types of seismic events |
| VerfasserIn |
Y. He, D. Yang, J. Qian, 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 ; 11, no. 8 ; Nr. 11, no. 8 (2011-08-05), S.2173-2180 |
| Datensatznummer |
250009617
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| Publikation (Nr.) |
 copernicus.org/nhess-11-2173-2011.pdf |
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| Zusammenfassung |
| The electron density data recorded by the Langmuir Probe Instrument (ISL,
Instrument Sonde de Langmuir) onboard the DEMETER satellite have been
collected for nearly 4 yr (during 2006–2009) to perform a statistical
analysis. During this time, more than 7000 earthquakes with a magnitude larger
than or equal to 5.0 occurred all over the world. For the statistical
studies, all these events have been divided into various categories on the
basis of the seismic information, including Southern or Northern Hemisphere
earthquakes, inland or sea earthquakes, earthquakes at different magnitude
levels, earthquakes at different depth levels, isolated events and all
events. To distinguish the pre-earthquake anomalies from the possible
ionospheric anomalies related to the geomagnetic activity, the data were
filtered with the Kp index. The statistical results obviously show that the
electron density increases close to the epicentres both in the Northern and
the Southern Hemisphere, but the position of the anomaly is slightly shifted
to the north in the Northern Hemisphere and to the south in the Southern
Hemisphere. The electron density related to both inland and sea earthquakes
presents an anomaly approximately close to the epicentres, but the anomaly
for sea earthquakes is more significant than for inland earthquakes. The
intensity of the anomalies is enhanced when the magnitude increases and is
reduced when the depth increases. A similar anomaly can also be seen in the
statistical results concerning the isolated earthquakes. All these
statistical results can help to better understand the preparation process of
the earthquakes and their influence up to the ionospheric levels. |
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