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Seismo- Electromagnetics
Atmospheric
anomalies observed during earthquake occurrences
H. Fujiwara *, M. Kamogawa * et al. (* Co-first authors)
Appearance of anomalies in the atmosphere before earthquakes (EQs) has
been verified, through observation of anomalous transmission of VHF
electromagnetic (EM) waves beyond line-of-sight. Anomalous increase of
the received intensity for a few minutes - several hours on a day was
identified by the previous 15-day running median and its inter-quartile
range. The cross-correlation between the EQ occurrences and the
anomalies shows that the appearance of anomalies was significantly
enhanced within 5 days before M≥4.8 EQs. The one-day average number of
the anomaly appearance within 5 days was found 2.4 times larger than
that of other days. Through the polarization measurement of the
received EM waves, the anomalies were found to occur in the atmosphere.
Fujiwara*,
and Kamogawa* et al., Atmospheric anomalies observed during earthquake
occurrences, Geophys. Res. Lett., Vol. 31, L17110,
doi:10.1029/2004GL019865, 2004. * Co-first authors
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