Abstract
An additive least-squares-method algorithm was developed for spectrally estimating unknown parameters of a geophysical signal on a background of steady-state noise having an unknown spectral density. The algorithm was tested using data of regime observations of lithospheric deformations in the Elbrus region obtained using a deformation measuring Baksan laser interferometer (deformograph). The algorithm was used to estimate the parameters of the natural oscillation modes of the Earth excited by strong earthquakes.
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