Fig. 5

a Comparison of peak frequencies between weak-motion (PGA < 20 cm/s2) and strong-motion (PGAs > 100 cm/s2) S-H/V spectral ratios. b Comparison of weak-motion peak spectral ratios with strong-motion (PGAs > 100 cm/s2) spectral ratios at the peak frequencies of weak motions. c Example plot depicting the peak frequencies compared in (a) and the spectral ratios compared in (b)