Empirical scaling of Fourier spectrum amplitudes of recorded strong earthquake accelerations in terms of Modified Mercalli Intensity, local soil conditions and depth of sediments

Empirical scaling equations of Fourier spectrum amplitudes in terms of the Modified Mercalli Intensity (MMI), local soil conditions (‘rock’, stiff soil, and deep soil), and local geologic conditions (depth of sediments) are presented. It is shown that both soil and geological site effects should be used together in estimation of the site specific Fourier amplitude spectra.