The Relation between Microtremors and a Little Deep Underground Structure in the Nagano-basin.
抄録
The observations of microtremors in the Nagano-basin were carried out at 12 spots along the two profiles of which underground structures were available from the existing data of explosion seismic observation of the area. Microtremors in the directions of NS, EW, and up-down were observed simultaneously by using three microtremometers with a pendulum of 10 sec. period. From a comparison between the Fourier spectrum of the microtremors and the amplification spectrum calculated by the theory of multiple reflection, it was confirmed that the longest predominant period of the microtremors at most of the spots and the period of the 1-st mode of the amprification spectrum had conciderable agreement.
長野盆地のやや深い地層構造と常時微動の関係について
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nagano_nct-20-17.pdf
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