Diurnial periodicity of strong earthquakes of Garm research area

The diurnial periodicity of Garm Polygon earthquakes of various energy classes K [(magnitudes M): weak, K < 6.0 (M < 1.1); moderate, 6.0 < K < 8.0 (1.1 < M < 2.2); strong, K > 8.0 (M > 2.2)] has been studied. The time series of weak earthquakes is characterized by maximum activity at night and a clear diurnal periodicity that practically disappears for moderate earthquakes. Such periodicity can be traced again in the time series of the strong earthquakes practically antiphased to weak earthquakes; i.e., the maximum strong earthquakes occurred during the day time.