SPATIAL VARIATION OF SEISMIC GROUND MOTION MODELED BY FK SPECTRUM

Abstract

Using a Fourier transform and coordinate transform, the space-time cross-spectral density function, which is often used to represent spatially varying seismic motion, is derived from a general frequency-wavenumber power spectrum model. Although the existence of a dominant wave component is not assumed, the resultant cross-spectrum model becomes the same as the one proposed by Loh. Hence the Loh's model is found to be applicable to express general stochastic wave fields.