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Earth, Planets and Space
Fig. 19 | Earth, Planets and Space

Fig. 19

From: Strong-motion simulation for the 1944 Tonankai earthquake based on the statistical green’s function method and stochastic representation of complex source process

Fig. 19

Examples of the regression procedure for the amplitude degradation as a function of the effective shear strain (PGV/Vs30) at 1 Hz and 10 Hz (top) and the resultant regression coefficients of nonlinearity as a function of period (reciprocal of frequency) applicable to the site term in the form of Fourier spectra (bottom). Open circles in the latter figure are regression coefficients for individual periods as shown in the top panels, while the red curve is derived from their smoothed average. For comparison, the same regression coefficients for the pseudo-velocity response spectra (pSv) by Yamaguchi and Midorikawa (2014) were also plotted (blue broken line)

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