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| | Abstract | | We performed microtremor array measurements at the temporary strong motion stations for aftershocks of the 2016 Kumamoto earthquake to investigate the local site effect due to shallow soil structure on the strong motion records. SPAC method was used to estimate phase velocity dispersion curve of Rayleigh wave. The inversion of the dispersion curve revealed the shallow S-wave velocity structures. We found that the uppermost low velocity layer with an S-wave velocity of about 100m/s exists with about 5m thickness and the shallow soil structures have dominant frequencies at 3 - 4 Hz with the factors of 7 - 9 at severely damaged sites. |
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