8 of the Biggest Tsunamis in History

(via Mental Floss) Most tsunamis go unnoticed. Defined as a wave caused by a disturbance like an earthquake, landslide, or volcanic eruption, tsunamis often reach just a few inches in height, according to NOAA. But when the inciting event is strong enough, the results can be disastrous. The most powerful tsunamis move as fast as jet planes across the open ocean and grow as tall as skyscrapers. When they reach land, they can decimate entire towns in minutes.