Fig. 4From: Cause of destructive strong ground motion within 1–2 s in Mukawa town during the 2018 Mw 6.6 Hokkaido eastern Iburi earthquakeS-wave horizontal-to-vertical spectral ratios at HKD126. The red line represents the spectral ratio for main shock; a blue line with the light blue shadow represents the average spectral ratio and the standard deviation for weak motionsBack to article page