根据目前的理论,地球不是一个实心不变的球体,而是由不同性质的地核、地幔、地壳等组成,就像是一个鸡蛋。而地球表面的地壳也不是一个整体,就像一些漂移在液体上的破碎的鸡蛋壳。当地球内部运动引起地壳相互运动,并相互碰撞时,地壳可能会快速释放能量,造成震动,就产生了地震。 According to the current theory, the earth is not a solid sphere, but instead consists of different kinds of nuclei, mantle, crust, etc. It is like an egg. The earth’s surface crust is not a whole, like some drift in the liquid broken egg shell. When the earth’s internal movement causes the earth’s crust to move with each other and collide with each other, the earth’s crust may release energy rapidly and cause vibration, thus creating an earthquake.