The possible slow slip of South China block before the great Wenchuan earthquake may be the cause of tremors, which is related to some frictional processes of the slow slip.

• 因此我们的初步推测是：异常颤动产生的可能原因是地震爆发前华南地块可能开始了慢滑移，滑移时的摩擦产生低频颤动。