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| | Abstract | | Dense earthquake observation was carried out at Tsukuba Technology and Development Center. The spectral ratio to the reference site have two peaks at a period of about 0.1 seconds and 0.2 seconds. The point where the peak of the spectral ratio is seen, in the three-dimensional S-wave velocity structure model by surface wave and microtremor array method, S-wave velocity of the surface layer shows a low Vs. |
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