Due to the vibration of the ground. Due to the cooling power to discharge accumulated within the world come out suddenly to balance of crust. Usually caused by the movement of the fault within the crust layer at the outside of the structure of the world. There is a movement, or change slowly to date.
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![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)