白木微小地震観測所における観測の概要 1965-1973
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概要
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Shiraki Microearthquake Observatory (SHK) has dual purposes. One is the investigation of seismicity in Western Honshu, Japan, through microearthquake observation and the other is the teleseismic observation. For the first purpose, Hagiwara Electromagnetic Seismograph System (in this case, T0=1.0 sec, Tg=0.2 sec, V=100000, 3 components*) is installed at the station and also three satellite stations Mikawa (replaced by Uzuto from February, 1970, to December, 1971), Kutsugahara and Fube. Four stations are located 40 to 50km apart from each other. HES seismograph at Shiraki has been in operation since August, 1965, at Mikawa since September, 1967, at Kutsugahara since May, 1968, and at Fube since December, 1968.