深井戸地震計による観測 : 第1報
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概要
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Earthquakes were recorded in two wells, the one 64m deep at Nokogiriyama in Chiba Prefecture and the other 380m deep in the cambus of the University of Tokyo at Hongo, in order to increase the signal to noise ratio on the seismograms especially of the microearthquakes.
- 1967-01-30
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