上下颠动。
地震发生时，往往是先感到上下颠动，随后又会感到左右摇摆，原因在于地震波纵波比横波传播速度快，所以先会颠动后摇晃。但横波不能在液体中传播，所以坐在船上的你只会感到上下颠动，不会感到左右摇晃。
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