Fig. 15

Rayleigh waves phase velocities from synthetic vertical velocities in Fig. 14 for model C. Synthetic waveforms are analyzed in 20 or 10 m ranges from the source: a 5–25 m, b 5–15 m, c 10–20 m, d 15–25 m). Gray shading represents normalized power of synthetic waveform velocity at each frequency. Open red dots represent observed phase velocities and solid lines are the theoretical dispersion curves of the Rayleigh wave fundamental mode for the 1D profile beneath the linear array in the model. The two dotted lines indicate the maximum and minimum wavelengths resolved by the linear array, respectively. The frequency bands of capable wavelength are focused