Astronomical Background of Global Huge Earthquakes

This paper analyzes the astronomical background of the global huge earthquakes with M ≥8.5.The result shows that most of the earthquakes has occurred in the seismic belts(regions) where is being corresponding seismic active period with the lunar path,solar active falling period and accelerating period of earth rotation.This is as for the variation of long period of astronomical factors.For the variation of short period of astronomical factors,whether for local time or local sidereal time and lunar phase there is the phenomenon of occurrence of concentrating a interval time for the earthquakes.For the short variation of earth rotation this phenomenon is clear;either the earthquakes occur in most fast or in lowst of earth rotation.The above-mentioned results indicate that the earthquakes occurrence is affected by astronomical factors.The astronomical factors are one of motive force causing earthquake from external world.The astronomical factors with long period may act as modulation for the earthquake-pregnant process.And the astronomical factors with short period will causing huge fluctuations of the system and earthquake occur when it act on seismic structure of away from balance state.