Abstract

All important earthquakes have been investigated from 2002 to 2021, their tidal origin proven and prediction stated. Prediction concerned earthquakes in Central Italy for 2016 and earthquake in South-Central Alaska for 2021. Tides move all plates westward probably with whole lithosphere but many plates among them as Pacific, Indo-Australian and African move northward into subduction zones created by gravity. Time position of earthquakes is given as resultant of action of both tidal components northward and westward, but many strongest earthquakes are triggered predominantly only by one component as Sumatran, with one repetition by Metonic cycle 1985 and 2004. Haiti earthquakes were triggered in 2010 by northward component, in 2021 by westward component. Earthquakes in many subduction zones are hardly predictable but they have foreshock precursors.