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The Relationship between Multifractal and Entropy Properties of Seismic Noise in Kamchatka and Irregularity of the Earth’s Rotation

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Abstract—The connection between the properties of seismic noise continuously recorded by the network of 21 broadband seismic stations in Kamchatka during nine years of observations (2011–2019) and the nonuniform rotation of the Earth is studied. The daily time series of median values calculated ​​over all network stations are analyzed for three noise parameters: multifractal singularity spectrum support width, generalized Hurst exponent, and minimum entropy of the distribution of the squared orthogonal wavelet coefficients. For identifying the common components in the variations of these parameters, their adaptive first principal component was calculated in a half-year moving window. The quadratic coherence spectrum between the first principal component of seismic noise characteristics and the time series of the length of the day was calculated in a 182-day moving time window. The time–frequency diagram of the coherence spectrum characterized by a sequence of coherence bursts concentrated in a narrow frequency band with periods from 11 to 14 days is analyzed. The time delays between the coherence bursts and the release of seismic energy in Kamchatka are estimated in a 5-year moving time window.

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The work was supported by the Russian Foundation for Basic Research under project no. 18-05-00133.

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Correspondence to A. A. Lyubushin, G. N. Kopylova or Yu. K. Serafimova.

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Translated by M. Nazarenko

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Lyubushin, A.A., Kopylova, G.N. & Serafimova, Y.K. The Relationship between Multifractal and Entropy Properties of Seismic Noise in Kamchatka and Irregularity of the Earth’s Rotation. Izv., Phys. Solid Earth 57, 279–288 (2021).

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