The earthquake is a natural disaster, a kind of phibat Earth. Most of the time is a natural phenomenon caused by the vibration of the ground. Due to release energy to drain the accumulated stress within the Earth comes out suddenly to balance of crust, fixed. Usually caused by the movement of the fault within the crust layer on the outside of the structure of the world. There is a movement that is slowly changing. Earthquakes occur when stress resulting from too many changes. This condition occurs most often in the realm of plate tectonics. Divided into lithosphere crust layer (lithosphere) called the earthquake occurred along the boundary of the crust that earthquakes between sheets (earthquake interplate) which occur frequently and over severe earthquake within the plates (intraplate earthquake)
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