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Park (1987) and Dahlen (1987) have described a method of incorporating the effects of multiplet coupling into synthetic long-period seismogram calculations on the aspherical Earth. Their method, called the subspace projection method, is shown to be equivalent to the degenerate second-order perturbation theory. We may write the equation of motion for normal modes of the unperturbed, spherically symmetric Earth

On the subspace projection method to calculate synthetic long-period seismograms.