著者

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

出版者

日本学士院

雑誌

Proceedings of the Japan Academy, Series B (ISSN:03862208)

巻号頁・発行日

vol.85, no.10, pp.485-490, 2009 (Released:2009-12-14)

参考文献数

7

被引用文献数

2 2

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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.)