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| Titel |
Simultaneous observations of surface displacements from GPS and ionospheric perturbations from VLF transmitter signals around major seismic events in Japan |
| VerfasserIn |
Yasuhide Hobara, Genki Suzuki, Chieh-Hung Chen, Masashi Hayakawa |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080543
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| Zusammenfassung |
| Ionospheric anomalies at the low latitude were reported before major seismic activities by using VLF transmitter signals. Although possible generation mechanisms of the precursory perturbations have been proposed such as anomalous electric field and atmospheric waves originated from the ground, the experimental evidence indicating the coupling between the lithospheric activities and overlaying ionosphere before seismic events were rare. In this paper we analyze the VLF transmitter amplitude data from our VLF observation network to identify the ionospheric perturbations together with frequency dependent filtered surface displacement data from GPS for different earthquakes in Japan. As a result, both ionospheric perturbations and surface displacements are observed about one week before for some of the shallow earthquakes, which may indicate the coupling between the precursory ground movements and relevant ionospheric perturbations. |
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