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An annual period in the Earth seismicity variations; I, Dependence on earthquake magnitude and focal depth



An annual period in the Earth seismicity variations; I, Dependence on earthquake magnitude and focal depth



Izvestiya - Russian Academy of Sciences Physics of the Solid Earth



The Fourier transformation was used to analyze fluctuations in the global seismic activity (daily amounts of earthquakes) between 1964 and 1990. The database is the UX DAT catalog (1928-1990) containing information on N = 209554 earthquakes. A reliable period of P = 1 year is found. Variations with this period are shown to be characteristic only of weak earthquakes with M nearly equal 3.0-4.7. The focal depth dependence of the annual period is most pronounced in the 0-60- and 90-140-km depth intervals.

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