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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Subsurface velocity structure and site amplification characteristics in Mashiki Town, Kumamoto Prefecture, Japan, inferred from microtremor and aftershock recordings of the 2016 Kumamoto earthquakes

Fig. 4

Fourier spectral ratios between each temporary aftershock observation site and Hi-net station N.MSIH for all detected events. Blue and red traces show the ratios for the S wave portions from NS and EW components, respectively. Thin traces show the spectral ratios derived for each event and thick traces corresponds to the median values. Note that the sampling frequencies at the temporary sites have been reduced to 100 Hz

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