Methodical aspects of estimation of trigger effect of seasonal prevalence on seismicity

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   On the example of Kuril-Kamchatka region, the relation between earthquake
   occurrence and season change is considered. Season change is determined by
   the year cycle time of the Earth rotation around the Sun and by the
   inclination of the planet rotation axis relative to the orbital plane, and
   it can be considered as a trigger on earthquake occurrence with different
   energy level, including strong events.

   In this study we use astronomical seasons, which are determined by the
   dates of solstices and equinoxes. Appling the epoch superposition method,
   statistical significance of timing between season phases and Kamchatka and
   Northern Kuril earthquakes is estimated.