What is a tsunami?

Tsunamis are giant waves caused by earthquakes or Volcanic eruptions under the sea.Out in the depths of ocean, tsunami waves do not dramatically increase in height.But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.The speed of tsunami waves depends on ocean depth rather than the distance from the source of the wave.Tsunami wave may travel as fast as jet planes over deep waters, only slowing down when reaching shallow waters.