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| Titel |
Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations |
| VerfasserIn |
S. N. Walker, V. Kadirkamanathan, O. A. Pokhotelov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 9 ; Nr. 31, no. 9 (2013-09-27), S.1597-1603 |
| Datensatznummer |
250086111
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1597-2013.pdf |
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| Zusammenfassung |
| Electromagnetic phenomena observed in association with increases in seismic
activity have been studied for several decades. These phenomena are generated
during the precursory phases of an earthquake as well as during the main
event. Their occurrence during the precursory phases may be used in
short-term prediction of a large earthquake. In this paper, we examine ultra-low frequency
(ULF) electric field data from the DEMETER satellite during the period leading up
to the Sichuan earthquake. It is shown that there is an increase in ULF wave
activity observed as DEMETER passes in the vicinity of the earthquake
epicentre. This increase is most obvious at lower frequencies. Examination of
the ULF spectra shows the possible occurrence of geomagnetic pearl
pulsations, resulting from the passage of atmospheric gravity waves generated
in the vicinity of the earthquake epicentre. |
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