136 地中音響振動の観察(オーガナイズドセッション : O.S.5 音響・振動の計測と可視化技術II)

概要

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It was reported that many people had heard low frequency sounds from the ground just before the Kobe earthquake January 1995. Besides, it was known among seismologists in Japan since early 1930s that a sound from the ground is sometimes audible concurrent with earthquakes around the very area our Laboratory was locating. With such background the author had initiated an observation of the sound and seismic motion using a monitoring system developed to detect possible signal from an imminent earthquake in collaboration with the geo-current and electromagnetic field monitoring group in the Laboratory for earthquake prediction. This paper introduces firstly the monitoring system for the sound in groundwater by the hydrophone set 50 m beneath the ground. Through observations of these sounds, the hydrophone system was found to have good performance to detect very small earthquakes occurred near the observatory or middle-class earthquakes far distant even in the area where background vibrations are not small.
一般社団法人日本機械学会の論文
2001-06-05