TSUNAMI Very long gravity wave
Tsunamis are most caused by undersea earthquakes that shift parts of the seabed upwards or downwards
The height of waves at the place of origin ranges between 0.01 and 5m.
As waves approach the coast, the distance between the adjacent wave crests diminishes from 1,500km to 5km.
Near the coast, waves can reach 10 m in height, and in areas with intricate landscape (wedge-shaped bays, river, valleys, etc.)...