Fig. 9From: Subsurface velocity structure and site amplification characteristics in Mashiki Town, Kumamoto Prefecture, Japan, inferred from microtremor and aftershock recordings of the 2016 Kumamoto earthquakesR/V spectral ratios of S-coda waves derived at KiK-net station KMMH16. Gray traces show the ratios from 19 events prior to the 2016 Kumamoto earthquake sequence and the black trace shows the average ratioBack to article page