Figure 6
Examples of nonparametric attenuation functions obtained for 10 different frequencies. Black circles are observed horizontal S-wave spectral amplitudes for all magnitudes, open circles are observed vertical S-wave spectral amplitudes for all magnitudes. Black continuous line corresponds to the attenuation function found for the horizontal spectral amplitudes (cm/s2) and dashed line corresponds to the attenuation function found for the vertical component of the acceleration spectral amplitudes (cm/s2).