In the open ocean,Tsunamis travel at about the same speed as a commercial airliner.

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Tsunamis can travel at speeds of up to 500 miles per hour (800 kilometers per hour) in deep ocean water, which is roughly equivalent to the cruising speed of a commercial airliner. However, as a tsunami approaches shallow waters near the shoreline, its speed decreases, and its amplitude increases, resulting in the destructive force that we associate with tsunamis.

In the Open Ocean,Tsunamis Travel at About the Same Speed