Most of the earthquakes is limited to only the layer of crust. The crust is not the same piece all because when a liquid hot plate tectonics grade clash, it will push the issue.
Earthquakes mostly confined to the top of the crust. The crust is not all the same. Because that's when the battle heated floor plates. It will push out The crack of the crust is fragile and earthquake.
The earthquake mostly limited to only a layer of the earth's crust. The earth's crust is not the same pieces. Due to the fact that when the liquid hot vs I plates. Will push themselves.