a long time :)
Japan is a country that is most affected by them
yes they are if they are in the area of a tsunami
Well, actually tsunamis can affect only the coastal zones since they come from the sea.
hi
Any locality situated on a coastline is, theoretically, able to be affected by tsunamis. The NSW coast could easily be affected by a tsunami generated by seismic activity in New Zealand.
No. Tsunamis are a geologic phenomenon, so they are not affected by the weather.
China,singapore india,thialand
No, tsunamis occur due to the tectonic plates moving underneath the ocean. The movement of the plates is through covention currents within the magma which isn't affected by climate change.
any underground trenches are not affected by tsunamis, earthquakes etc.
yes
about 300 tsunamis happened world wide
There were tsunamis long before recorded history began, so it's impossible to answer the question.