Earthquake occurred in the crust in general.Within the crust constantly changing,the resulting in the role of the crustal deformation of rocks,broken,dislocation and then the earthquake.The earthquake effect is very extensive,also very destructive.The earthquake is the earth surface vibration of fast,it is like wind,rain,lightning,and same,it is on earth often happened a natural phenomenon.The earth quake vibration is the most intuitionistic,most common form.At the bottom of the ocean or in coastal area earthquake that can cause huge waves,called tsunami.Earthquakes are very frequent earthquakes occur around the world each year,about 500 million times