The largest recorded tsunami was a wave 1720 feet tall in Lituya Bay of Alaska. On the night of July 9, 1958 an earthquake along the Fair-weather Fault in the Alaska Panhandle loosened about 40 million cubic yards  of rock high above the northeastern shore of Lituya Bay. This mass of rock plunged from an altitude of just about 3000 feet down into the waters of Gilbert Inlet.

The impact generated a local tsunami that crashed against the southwest shoreline of Gilbert bay. The wave hit with such power that it swept totally over the spur of land that separates Gilbert Inlet from the main body of Lituya Bay. The wave then sustained down the entire length of Lituya Bay, over La Chaussee Spit and into the Gulf of Alaska. The force of the wave damaged all trees and vegetation from elevations as high as 1720 feet above marine level. This is the uppermost wave that has ever been known.