Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations
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 s...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2013-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/31/1597/2013/angeo-31-1597-2013.pdf |
| _version_ | 1818359522204319744 |
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| author | S. N. Walker V. Kadirkamanathan O. A. Pokhotelov |
| author_facet | S. N. Walker V. Kadirkamanathan O. A. Pokhotelov |
| author_sort | S. N. Walker |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T20:46:14Z |
| format | Article |
| id | doaj.art-ec0d4e8d229e4eaf9b8b2fe587622e38 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-13T20:46:14Z |
| publishDate | 2013-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-ec0d4e8d229e4eaf9b8b2fe587622e382022-12-21T23:32:01ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762013-09-01311597160310.5194/angeo-31-1597-2013Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observationsS. N. Walker0V. Kadirkamanathan1O. A. Pokhotelov2ACSE, University of Sheffield, Sheffield, UKACSE, University of Sheffield, Sheffield, UKSchmidt Institute of Physics of the Earth RAS, Moscow, RussiaElectromagnetic 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.https://www.ann-geophys.net/31/1597/2013/angeo-31-1597-2013.pdf |
| spellingShingle | S. N. Walker V. Kadirkamanathan O. A. Pokhotelov Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations Annales Geophysicae |
| title | Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations |
| title_full | Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations |
| title_fullStr | Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations |
| title_full_unstemmed | Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations |
| title_short | Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations |
| title_sort | changes in the ultra low frequency wave field during the precursor phase to the sichuan earthquake demeter observations |
| url | https://www.ann-geophys.net/31/1597/2013/angeo-31-1597-2013.pdf |
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