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| | Abstract | | Extensive building damage occurred in Mashiki Town and its surroundings, Kumamoto Prefecture, by the 2016 Kumamoto Earthquake. Following the survey of Nakazawa et al. (2016), building damage in the area between Mashiki Town and Higashi-ku of Kumamoto City was concentrated in the lower slope at the margin of the upland formed of the pyroclastic flow deposits from Aso Volcano. We conducted microtremor survey to examine the relation between the topographical features and the ground characteristics. As the results, the analysis of microtremor data showed that the average S-wave velocity to a depth of 30 m in this damage-concentrated area was, on average, about 20% smaller than that in the adjacent areas with less damage. |
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