Development of newly designed VHF interferometer system for observing earthquake-related atmospheric anomalies

Isao YAMAMOTO; Hironobu FUJIWARA; Masashi KAMOGAWA; Atsushi IYONO; Valeri KROUMOV; Takashi AZAKAMI

doi:10.2183/pjab.85.485

Original Papers

Development of newly designed VHF interferometer system for observing earthquake-related atmospheric anomalies

Isao YAMAMOTO, Hironobu FUJIWARA, Masashi KAMOGAWA, Atsushi IYONO, Valeri KROUMOV, Takashi AZAKAMI

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Keywords: earthquake, atmospheric anomalies, interferometric observation, FM radio waves, bistatic radar

JOURNAL FREE ACCESS

2009 Volume 85 Issue 10 Pages 485-490

DOI https://doi.org/10.2183/pjab.85.485

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Abstract

Temporal correlation between atmospheric anomalies and earthquakes has recently been verified statistically through measuring VHF FM radio waves transmitted beyond the line-of-sight. In order to locate the sources of such atmospheric anomalies, we developed a VHF interferometer system (bistatic-radar type) capable of finding the arrival direction of FM radio waves scattered possibly by earthquake-related atmospheric anomalies. In general, frequency modulation of FM radio waves produces ambiguity of arrival direction. However, our system, employing high-sampling rates of the order of kHz, can precisely measure the arrival direction of FM radio waves by stacking received signals.

(Communicated by Seiya UYEDA, M.J.A.)

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