地球内部过程 Tsunamis海啸 and coastal Flooding These are seismic sea waves sometimes improperly called " tidal waves,although they have nothing to do with tides. When an undersea or near-shore earthquake occurs, sudden movement of the sea floor may set up waves traveling away from that spot, like ripples in a pond caused by a dropped pebble. Contrary to modern movie fiction, tsunamis are not seen as huge breakers in the open ocean that topple ocean liners in one sweep In the open sea, the tsunamis are only unusually broad swells on the water surface 环境迪顶学 minoucntalocelogu ,率地球内部过程 Tsunamis海啸 and Coastal Flooding These are seismic sea waves, sometimes improperly called “tidal waves,” although they have nothing to do with tides. When an undersea or near-shore earthquake occurs, sudden movement of the sea floor may set up waves traveling away from that spot, like ripples in a pond caused by a dropped pebble. Contrary to modern movie fiction, tsunamis are not seen as huge breakers in the open ocean that topple ocean liners in one sweep. In the open sea, the tsunamis are only unusually broad swells on the water surface