Because they cause floods that's why
its called a tsunami
Tsunami is called "सुनामी" in Hindi.
"Tsunami" means Japanese harbor wave. That's why they call it tsunami.
Its still called a tsunami. There was a big Tsunami there in 1861/62
it is called a tsunami
A tsunami is also sometimes called a tidal wave.
it is called a tsunami
The top of a tsunami wave is called the crest. It represents the highest point of the wave as it approaches the coastline.
that's called an earthquake.
Tsunami and earthquakes
Tsunamis don't have names <----- by someone i don't know ok well right now i am someone else improving this question :) the earthquake was called 'the great east japan earthquake' so i guess its called 'the great east japan tsunami. <----- by ME
The succession of waves is called a tsunami.