Atmospheric anomalies observed during earthquake occurrences

Fujiwara, Hitoshi; Kamogawa, Masashi; Ikeda, Masayuki; Liu, J. Y.; Sakata, Haruo; Chen, Y. I.; Ofuruton, H.; Muramatsu, S.; Chuo, Y. J.; Ohtsuki, Y. H.

doi:10.1029/2004gl019865

Cited by 85 publications

(46 citation statements)

References 5 publications

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“…To find out the relation between the anomalous propagation and seismicity, we adopted statistical analysis to the observational results and calculated the probability gain, which is the ratio of the observational probability to the non-related probability. These are further distinguished from the previous reports (Fujiwara et al, 2004;Yonaiguchi et al, 2007).…”

Section: Introductionmentioning

confidence: 87%

Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

Motojima

Haga

2014

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper was intended to find out any relation between anomalous line-of-sight propagation on the very high frequency (VHF) band and occurrences of earthquakes near the VHF propagation paths. The television and FM radio broadcasting waves on the VHF band were monitored continuously over the long term. For that purpose, a multidirectional VHF band monitoring system was established and utilized. Anomalous line-of-sight propagation on the VHF band was distinguished from the monitored wave by using a statistical analysis. After the stochastic consideration, it was found out that earthquakes associated with anomalous propagation were characterized by magnitude of earthquakes M ≥ 4.5, and distances from epicenters L ≤ 75 km. The anomalous propagation was monitored on the VHF band a few days before the associated earthquakes occurred. Moreover, the anomaly appeared on multidirectional propagation paths simultaneously. The anomaly on the line-of-sight propagation indicates the possibility of narrowly focusing the area of the epicenter of earthquake.

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Section: Introductionmentioning

confidence: 87%

Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

Motojima

Haga

2014

Nat. Hazards Earth Syst. Sci.

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“…Fujiwara et al (2004) observed that the appearance of atmospheric anomalies associated with the anomalous transmission of VHF EM-waves beyond line-of-sight was significantly enhanced within the 5-day period immediately preceding earthquakes of moderate magnitude (generally, M ≥ 4.8).…”

Section: Ground and Space Short-term Seismic-associated Eme Signalsmentioning

confidence: 95%

The ESPERIA satellite project for detecting seismo-associated effects in the topside ionosphere. First instrumental tests in space

et al. 2008

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In recent times, ionospheric and magnetospheric perturbations constituted by radiation belt particle precipitations, variations of temperature and density of ionic and electronic components of ionospheric plasma as well as electric and magnetic field fluctuations have been detected on board of the LEO satellites and associated with earthquake preparation and occurrence. Several mechanisms have been suggested as justifying the seismoelectromagnetic phenomena observed in the upper lithosphere and in the topside ionosphere before, during and after an earthquake. Their propagation in these media has also been investigated, but physical knowledge of such processes is below standard. Consequently, coordinated space and ground-based observations based on data gathered simultaneously in space and at the Earth's surface are needed to investigate seismo-associated phenomena. To this end, the ESPERIA space mission project has been designed for the Italian Space Agency (ASI). To date, a few instruments of its payload have been built and tested in space. This paper reports on the justification, science background, and characteristics of the ESPERIA mission project as well as the description and testing of ESPERIA Instruments (ARINA and LAZIO-EGLE) in space.

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“…Furthermore, Takano et al (2004) found, additionally, some anomalous reception of overseas TV broadcasting signals in Japan, which is believed to be attributed to seismo-ionospheric effect. Recently, based on the hypothesis of seismo-atmospheric perturbation as suggested by Fukumoto et al (2001), Fujiwara et al (2004) attempted to estimate the correlation between the anomalous VHF signal reception and earthquake. The crosscorrelation between the two has shown that the appearance of anomalies is significantly enhanced within 5 days before an earthquake with magnitude X4.8.…”

Section: Introductionmentioning

confidence: 99%

On the statistical correlation of over-horizon VHF signals with meteorological radio ducting and seismicity

Yonaiguchi

Ida

Hayakawa

2007

Journal of Atmospheric and Solar-Terrestrial Physics

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Atmospheric anomalies observed during earthquake occurrences

Cited by 85 publications

References 5 publications

Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

The ESPERIA satellite project for detecting seismo-associated effects in the topside ionosphere. First instrumental tests in space

On the statistical correlation of over-horizon VHF signals with meteorological radio ducting and seismicity

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