The planetary geometries were studied at the moments of 92 strong earthquakes with a magnitude of more than 8 on the Richter scale (R8+) for the period from 1900 to 2011. Three main planetary schemes were specified, namely the schemes of the generalized Archimedes lever (gAL) and the Kepler conjunction (gKc), as well as a new geometry of the triangles of the remote signal catcher (cRS). It was discovered 22 gAL, 42 gKc and 28 cRS geometries, which are 23.9%, 45.7%, and 30.4%, respectively, from the total 92 studying cases. It was found that in some earthquakes; the planetary geometries are absolutely identical, which indicates the universality of the mechanism that caused the earthquake. The triggered effect does not depend on the distance between the planets and the mass of the planets, so the mechanism is identified as an inertial gravitational interaction. The triggered effect increases with the multiplicity of the ratio of distances between planets, as well as with pairwise planetary parallelism, which probably indicates about the wave nature of inertial effects. The triggering effect increases with increasing multiplicity of the ratio of distances between planets, as well as with pairwise planetary parallelism, which probably indicates about the wave nature of inertial effects. According to the Archimedes' lever principle, the Third Law of Motion is changed by adding a few words. It is assumed that inertia is a special case of gravity, namely gravitational self-induction, which really depends, like any self-induction, only on the geometry of the task.