The earth consists of at least 12 spinning tectonic units, each resulting in the formation a low-pressure (or a tectonic cave) and a high-pressure zones at the front and back of the tectonic unit. These zones are expanded by stopped a plate (or crust). In this article, we will see that all the phenomena of the earth, including earthquakes, are the balancing of these zones. Because of this, the back and front faults of tectonic plates (crusts) are the same faults or potential earthquake focal points that can be identified by the earth's crustal convexity and concavity as well as the experience of earthquakes.