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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Rupture process of the main shock of the 2016 Kumamoto earthquake with special reference to damaging ground motions: waveform inversion with empirical Green’s functions

Fig. 3

Fourier spectral ratios between the EGF events. The left panel shows the spectral ratio of EGF3 with respect to EGF1 at eight target stations (gray lines) and their logarithmic mean (green line). The mean spectral ratio is almost unity at low frequencies. Similarly, the right panel shows the spectral ratio of EGF4 with respect to EGF2 at eight target stations (gray lines) and their logarithmic mean (green line). The mean spectral ratio is almost unity at low frequencies

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