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| Titel |
Electron and ion density variations before strong earthquakes (M>6.0) using DEMETER and GPS data |
| VerfasserIn |
M. Akhoondzadeh, M. Parrot, M. R. Saradjian |
| 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 ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-11), S.7-18 |
| Datensatznummer |
250007871
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| Publikation (Nr.) |
 copernicus.org/nhess-10-7-2010.pdf |
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| Zusammenfassung |
| Using IAP (plasma analyzer) and ISL (Langmuir probe) experiments onboard
DEMETER (Detection of Electromagnetic Emissions Transmitted from Earthquake
Regions) satellite and GPS (Global Positioning System) measurements, we have
statistically analyzed the variations of the electron and ion densities to
search for disturbances in the vicinity of four large earthquakes prior to
events. The indices Dst and Kp were used to distinguish
pre-earthquake anomalies from the other anomalies related to the geomagnetic
activities. For each studied case, a very good agreement was found between
the different parameters estimated by DEMETER and GPS data in the detection
of pre-seismic anomalies. Our statistics results show that the anomalous
deviations prior to earthquakes have different sign from case to case, and
that their amplitude depends on the magnitude of the earthquake. It has also
been found that the electron density measured by the ISL experiment at night
detects anomalous variations significantly before the earthquakes. The
appearance of positive and negative anomalies in both of DEMETER and TEC
(Total Electron Content) data during 1 to 5 days before all studied
earthquakes during quiet geomagnetic conditions indicates that these
anomalous behaviors are highly regarded as seismo-ionospheric precursors. |
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