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| Titel |
Novelty detection in time series of ULF magnetic and electric components obtained from DEMETER satellite experiments above Samoa (29 September 2009) earthquake region |
| VerfasserIn |
M. Akhoondzadeh |
| 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 ; 13, no. 1 ; Nr. 13, no. 1 (2013-01-09), S.15-25 |
| Datensatznummer |
250017526
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| Publikation (Nr.) |
 copernicus.org/nhess-13-15-2013.pdf |
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| Zusammenfassung |
| Using ULF (ultra low frequency) measurements of magnetometer and ICE (Instrument Champ Electrique)
experiments on board the DEMETER satellite, possible irregularities in ULF
magnetic and electric components have been surveyed in the vicinity of Samoa
(29 September 2009) earthquake region. The data used in this paper cover
the period from 1 August 2009 to 11 October 2009. The anomalous variations
in magnetic components (Bx, By and Bz) were clearly observed
on 1 and 3 days before the event. It is seen that the periodic patterns of
the magnetic components obviously changed prior to the earthquake. These
unusual variations have been also observed in the variations of polarization
index obtained from the magnetic components during the whole period at
~10:30 and ~22:30 LT. It is
concluded that the polarization exhibits an apparent increase on 1 and 3 days preceding the earthquake. These observed unusual disturbances in ULF
magnetic components were acknowledged using the detected perturbations in
ULF electric components (Ex, Ey and Ez) in the geomagnetic
coordinate system. Finally, the results
reported in this paper were compared with previous results for this Samoa
earthquake. Hence, the detected anomalies resulting from the magnetometer
and ICE ULF waveforms in quiet geomagnetic conditions could be regarded as
seismo-ionospheric precursors. |
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