Earthquake is also called the ground shaking, to vibration, is the rapid release of energy in the process of earth's crust caused vibration, generates seismic waves during a natural phenomenon. Earth jostling each other between plate and plate, plate edge and plate internal produce dislocation and fracture, is the main cause of ground vibration (earthquake).
Started happening earthquake site is called the source, the source is directly above the ground is called the epicenter. The devastating earthquake ground vibration called the magistoseismic area, the most strong place magistoseismic area that is often the epicenter area [2]. Earthquake often cause serious casualties, can cause fires, floods, poisonous gas leak, the proliferation of bacteria and radioactive substances, can also cause tsunamis, landslide, collapse, ground cracks and other secondary disasters.
4日中午12时25分，辽宁省营口市盖州市(北纬40.5度，东经122.4度)发生4.3级地震，震源深度6千米。沈阳、大连、鞍山、辽阳、本溪、抚顺、盘锦等多地的网友表示有震感。
地震又称地动、地振动，是地壳快速释放能量过程中造成振动，期间会产生地震波的一种自然现象。地球上板块与板块之间相互挤压碰撞，造成板块边沿及板块内部产生错动和破裂，是引起地面震动(即地震)的主要原因 。
地震开始发生的地点称为震源，震源正上方的地面称为震中。破坏性地震的地面振动最烈处称为极震区，极震区往往也就是震中所在的地区[2] 。地震常常造成严重人员伤亡，能引起火灾、水灾、有毒气体泄漏、细菌及放射性物质扩散，还可能造成海啸、滑坡、崩塌、地裂缝等次生灾害。
