Most of the earthquakes is limited to only the layer of crust. The crust is not the same as the entire piece. When the 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. When the fluid level hot top plates to push it 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. When the liquid hot plates will push against me out!