An earthquake , quake or earthquake, is an earth tremor produced by the release of accumulated energy, in the form of seismic waves, in a place in the lithosphere. They are another of the manifestations of the terrestrial internal energy.
The earthquakes are produced by the activity of faults, by friction between lithospheric plates (in converging edges and edges shear or tear), by volcanoes, or can even give rise to them some human activities.
The fracture of the rocks occurs at a certain depth, the more destructive the earthquake is the lower the depth at which it has occurred.
The point where the earthquake occurs is called the hypocenter, while the place on the earth's surface above the hypocenter is called the epicenter.
The earthquakes can produce shifts in the earth's crust, earthwork, tsunamis or volcanic activity.