Abstract
Dependence of the diurnal periodicity phase diagrams for Southern California earthquakes on their magnitude is studied with the Rayleigh-Schuster method. The highest statistical significance of diurnal periodicity is characteristic for the weakest non-representative earthquakes occurring in the night rather than in the daytime. The statistical significance of the earthquake diurnal periodicity decreases as the earthquake magnitude increases. Diurnal periodicity disappears in the neighborhood of the catalog magnitude of completeness. It appears again with a reasonably high level of statistical significance in the magnitude range exceeding the magnitude of completeness. However, its phase becomes opposite: strong earthquakes are more frequent in the daytime. Phase diagrams of different spatial earthquake sample groups are compared, and the night and daytime earthquake recurrence graphs are studied.
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Original Russian Text © A. Ya. Sidorin, 2011, published in Voprosy Ingenernoy Seismologii, vol. 38, no. 4, pp. 69–81.
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Sidorin, A.Y. Changes in the diurnal periodicity of Southern California earthquakes in the neighborhood of the catalog magnitude of completeness. Seism. Instr. 48, 342–350 (2012). https://doi.org/10.3103/S0747923912040044
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DOI: https://doi.org/10.3103/S0747923912040044