A more detailed measurement of the edges reached by the wave estimated that its height was about 517 meters. The trees and soil in the area were so cleared that underground rocks were revealed.
On July 9, 1958, the highest tsunami in history was recorded. Particularly high tsunamis are also called megacunamies, and are most often caused by large landslides, volcanic eruptions or meteorite impacts.
The megacunami was caused by a giant landslide from one mountain to the sea. That mountain is located in the territory of the American federal state of Alaska. The landslide was caused by a strong earthquake nearby, with a magnitude of 8.3 on the Richter scale. On that occasion, as much as 30 million cubic meters of rocks and ice fell from the mountain into the Gulf of Lituya. A sudden impact of such a mass into the sea caused a wave over 500 meters high!
There were some people in the bay at the time of the mega-tsunami, although the area is very sparsely populated. Five people were killed. It is almost unbelievable that Howard Ulrich and his son managed to survive, by having their boat swept away on a wave, high above ground level. The trees and soil in the area were so cleared that underground rocks were exposed. A more detailed measurement of the edges reached by the wave estimated that its height was about 517 meters.