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| | Abstract | | Temporal monitoring of ground motion in Kumamoto Castle at 15 points were performed in November 22, 2016. Micro-tremor was measured and aftershocks of Kumamoto Earthquake of April, 2016 were recorded. The earthquake ground motions at each site in the castle shows different ground motions. The response spectra of 15 sites of an aftershock of M2.7 were grouped into some five zones. The predominant period of H/V ratio of micro-tremor monitoring was longer than the response spectra of M2.7 record. This is due to the lack of the long period component of the aftershock of M2.7. The H/V spectral ratio at a site where a boring was performed with PS-logging was compared with predominant period for horizontally layered ground by boring with S velocity. The predominant period of micro-tremor result is longer than the estimated period for horizontally layered ground by boring with S-wave velocity. The difference may be either too shallow layer or 3D effects rather than 2D formation. Amplification at the edge of the stone masonry wall were observed over 2.0 ass expected theoretically. The amplified observation supports the concentrated damage of stone masonry wall at the depth near the top of the wall. |
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