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.