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| Titel |
On the statistical correlation between the ionospheric perturbations as detected by subionospheric VLF/LF propagation anomalies and earthquakes |
| VerfasserIn |
Y. Kasahara, F. Muto, T. Horie, M. Yoshida, M. Hayakawa, K. Ohta, A. Rozhnoi, M. Solovieva, O. A. Molchanov |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2008-07-09), S.653-656 |
| Datensatznummer |
250005639
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| Publikation (Nr.) |
 copernicus.org/nhess-8-653-2008.pdf |
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| Zusammenfassung |
| Relatively long-period (4 years) data on different propagation paths by
means of Japanese-Pacific VLF/LF network observation, are used to obtain
further statistical significance on the correlation of ionospheric
perturbations as revealed by VLF/LF propagation anomalies with earthquakes.
Earthquakes with magnitude greater than 6.0, taken place only within the
fifth Fresnel zone of each great-circle path are selected for the
correlation study. It is finally found based on the superimposed epoch
analysis that the nighttime trend (average amplitude) exhibits a significant
decrease exceeding 2σ (σ: standard deviation) several days
before the earthquake and the nighttime fluctuation exceeds the
corresponding 2σ again several days before the earthquake when the
earthquake depth is smaller than 30 km (shallow earthquakes). However, when
we treat all earthquakes including deep earthquakes, the trend shows a
significant decrease (just approaching 2σ line), and the nighttime
fluctuation shows a less significant broad enhancement before the EQ. |
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