Fig. 4From: Strong ground motion simulation of the 2016 Kumamoto earthquake of April 16 using multiple point sourcesObserved Fourier spectrum and site amplification spectrum G(f). Black line observed Fourier spectrum; red line site amplification spectrum G(f); solid line on the surface; and dotted line in the borehole. Observed records (black lines) are smoothed by a Parzen window of 0.05 Hz bandwidth. Peak frequencies are indicated by arrows Back to article page