How big is a tsunami?
Tsunamis range in size from inches to over a hundred feet.
In deep water (greater than 600 feet), tsunamis are rarely over 3 feet and will not be noticed by ships due to their long period (time between crests).
As tsunamis propagate into shallow water, the wave height can increase by over 10 times.
Tsunami heights vary greatly along a coast.� The waves can be amplified by shoreline and bathymetric (sea floor) features.
A large tsunami can flood low-lying coastal land over a mile from the coast.