How does tsunami occur?

Answer 1

underwater earth quakes
http://earthquake.usgs.gov/eqcenter/eqinthenews/2006/usqgaf/

Answer 2

Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water. Such large vertical movements of the Earth’s crust can occur at plate boundaries. Subduction earthquakes are particularly effective in generating tsunamis. As an Oceanic Plate is subducted beneath a Continental Plate, it sometimes brings down the lip of the Continental with it. Eventually, too much stress is put on the lip and it snaps back, sending shockwaves through the Earth’s crust, causing a tremor under the sea, known as an Undersea Earthquake.

Sub-marine landslides (which are sometimes triggered by large earthquakes) as well as collapses of volcanic edifices may also disturb the overlying water column as sediment and rocks slide downslope and are redistributed across the sea floor. Similarly, a violent submarine volcanic eruption can uplift the water column and form a tsunami.

Tsunamis are surface gravity waves that are formed as the displaced water mass moves under the influence of gravity and radiate across the ocean like ripples on a pond.

In the 1950s it was discovered that larger tsunamis than previously believed possible could be caused by landslides, explosive volcanic action and impact events. These phenomena rapidly displace large volumes of water, as energy from falling debris or expansion is transferred to the water into which the debris falls. Tsunamis caused by these mechanisms, unlike the ocean-wide tsunamis caused by some earthquakes, generally dissipate quickly and rarely affect coastlines distant from the source due to the small area of sea affected. These events can give rise to much larger local shock waves (solitons), such as the landslide at the head of Lituya Bay which produced a water wave estimated at 50 – 150 m and reached 524 m up local mountains. However, an extremely large landslide could generate a megatsunami that might have ocean-wide impacts.

Answer 3

Tsunamis occur due to underwater earthquakes, landslides or volcanic eruptions. Tsunamis travel at speeds ranging from 80-300 miles/hr. They may acheive upto 30 ft. The sea near the shore recedes, exposing tthe ocean floor. This is a natural tsunami warning. :D:D

Answer 4

could be man induced shock waves by a big explosion,the natural way is a rippling in the earths crust,that produces a subteranian earth quake.
this sets in motion a giant wave that can travel for thousands of miles.

there is also a super tsunami,that is caused by a landslide into the sea from a coastal mountain .
this causes a super tsunami that make the others look insignificant ,of over 20 metres in hight ,that can travel from one side of the Ocean to the other.
thers is a potential situation like this threatening ,the south east American coast ,but it could be hundreds of years before it happens ,but nothing is certain it could also be a lot sooner.
there was one on the east north American coast many years ago and the evidence is still visible

Answer 5

"Tsunami " is a Japanese term. "Tidal Wave" occurs more along the Japanese coast due to earthquake prone area.

Try dropping a pebble in bucket full of still water, you observe ripples or waves radiating out. Imagine an explosion (diwali bomb) at the bottom of the bucket full of water - Waves radiate out to the surface. Depending on the power of explosion the scale of the wave varies.

Tsunami is also the same. It is an after affect of some kind of movement beneath the sea. It could be due to underwater Volcanoes, Earthquake or similar happenings.

For more information visit
http://en.wikipedia.org/wiki/Tsunami

Answer 6

Your geography teacher will say that there different plates of earth which keep moving and when two such plates move into each other, it erupts into a tremor or earth quake. Underneath the sea, near Indonesia and Andaman & Nicobar Islands, the crash occured on 24th December, 2004. The collision occured much near the surface of the earth and that too for a pretty long distance, the movement of one plate lading to a the creation of fissure on the surface of earth for a considerable distance resulted in the displacement of a huge chunk of sea water. This literally churned the sea which resulted in strong waves of sea rolling over the coast areas and creating unimaginable amount of damage in its wake.

My religioun belief is that whenever we breach the natural law and moral law, the anger of God or Nature are exptressed in natural calamities. God had ordainined in Bible that he shall destroy the Earth with any more flood. In Hindu religion, also, it is believed that he has put the water in the sea and forbade the sea from crossing over the coastal line. He has enjoined 'Agni' to remain in the midst of the sea to check and control the sea. It is my belief that when man crosses all limits of morality, Nature some times cross the Lakshman rekha, to impress upon him the need for remaining within the ordained bounds.

Answer 7

whilst an earthquake or an underwater land slide ensue (the sea floor has many greater mountains then there are on land) this displaces the water and an power wave spreads out in a around pattered no longer lots diverse then a ripple on the exterior of a pond, different than it extremely is below water. via fact the ability reaches the shore there is far less water to feed the ability so as a result the wave gets bigger and larger till it slams into land and disperse. specific valuable components interior the soil nearing the cost will result the way the wave varieties. that's apperant once you look at japan's 33ft wave at present however a similar quake reason basically a three-6ft wave in Hawaii.

Answer 8

Tsunami occur...when you are not expecting it.

This already been discussed for so long in news papers and current affairs of TV for such a long time after such disaster in Malaysia , Thailand , India etc. world ever faced and you still searching answer? Either you want cross check do people have knowledge or you don't bother to read news papers.

Answer 9

when earthquakes occur under the surface of the earth in the deep oceans ...they create a movement not only in the land but also in the water... there are movements in it and huge waves are formed...that is what we call tsunami...all the best...

Answer 10

When there is a eathquake in the sea then Tsunami occurs

Answer 11

Under water Earthquakes.