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

Fig. 4

From: Use of Fourier phase characteristics and effective stress analyses for post-earthquake ground motion estimation: application to ESG6 blind prediction steps 2&3 dataset and JMA accelerometric data

Fig. 4

Fourier spectral ratios between KUMA and JMA for the horizontal components. The top left panel shows the Fourier spectral ratios for the five events with M ≥ 4.5 (No.64, No.104, No.109, No.205, No.206) for the horizontal components. The top right panel shows their geometric mean. The geometric mean for the five events shown in the top left panel was compared with the geometric mean for the three events that occurred in the Aso region. The former was used for the ensuing simulation. The bottom panel compares the geometric mean for the five events with the spectral ratio for the event No.43, which occurred approximately 2.5 h after the mainshock

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