### LOW-FREQUENCY SPECTRUM ASYMPTOTICS AS A MEASURE OF NONSTATIONARITY OF SOME GEOPHYSICAL PROCESSES

V.B.Lysenko and V. F. Pisarenko

Abstract

We present a method of statistical estimation of power $\alpha$ for low-frequency spectrum asymptotics $f(\lambda) \sim c/\lambda^{\alpha}$ for Gaussian and point processes. The method is applied to several geophysical processes: Earth's nutation, atmospheric pressure, and regional seismicity.

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Computational Seismology, Vol. 3.