what is a tsunami? and which countries have a high risk of tsunami ?

Answer 1

Tsunami (from the Japanese for Harbour Wave) or Tidal waves are caused by a geological event under the ocean. This can be an earthquake or continental shift which causes vast quantities of water to be displaced in a short space of time. The result is a large wave radiating out from the area which will gather momentum until it reaches land. (Tsunami ofter reach great heights as they near land due to the shallower waters being picked up by the momentum of the wave)

Areas of high risk are those where fault lines occur under the ocean such a the Pacific rim and indian ocean.

For further info, try http://en.wikipedia.org/wiki/Tsunami

Answer 2

A Tsunami is a wave phenomenon caused when the sea floor is either raised or lowered by a geological event, like an earthquake or even a landslide.

The raising or lowering of the sea floor causes the entire column of water (from top to bottom) to rise up (think it like throwing a pebble into a puddle) and spread out in all directions. At sea, the wave itself is very small (sometimes only inches high on the surface) because its wavelength is so long - and traveling upwards of 200 mph.

When the wave reaches a shoreline, it starts piling upwards, increasing in height (up to the height of the original deformation of the seafloor - usually not more than 25 - 30 feet) moving inland. A Tsunami does not break like a traditional ocean wave, since the wave itself can be kilometers in length - the tsumanis that hit Indonesia, Thailand, and India lasted for anywhere from 10 - 15 mins before finally retreating.

Since tsunamis are associated with earthquakes and other major geological events (like Volcanoes) - countries around the Pacific Rim (Japan, China, Taiwan, Indonesia, Australia, the United States, etc) are under threat (there is a well established Pacific Tsunami Early Warning System in place), but other areas are also at risk as well - Portugal was hit by a major tsunami in 1574, killing tens of thousands of people.

Answer 3

tsunami is a series of waves generated when a body of water, such as an ocean is rapidly displaced on a massive scale. Earthquakes, landslides, volcanic eruptions and large meteorite impacts all have the potential to generate a tsunami. The effects of a tsunami can range from unnoticeable to devastating.

i dont know to which countries it is a threat but it had destroyed parts of indonesia, Srilanka and some parts of india

Answer 4

tsunami iz a hurricane that causes a lot of damages in new orleans. new orleans and louisiana that's all that i can think of