what is tsunami and how is it formed?
964305
It is basically huge waves formed in a sea or ocean because of a displacement of water by an earthquake, underwater volcano,....
1169720
1. The water doesn't *always* recede from a beach prior to a tsunami, just about half the time.\n\n2. The only thing you can do is RUN AWAY from the coast, to ground as high as possible, as fast as possible. In most cases, you would be completely safe just a mile or two inland, or just a hundred feet above sea level.
26232
Absoutly, there is a ridge subduction zone off the pacific coast that is moving at a good clip.  We know through laser tomography, that the surface of this subduction zone isn't as smooth as many other fault lines.  We know what will happen as soon as it 'buckles', a huge earthquake, followed, of course by a sub surface wave, making a tsunami.\n\nAs to when, no clue.  The plate at the subduction zone isn't moving at a constant clip, but random.  So hard to say.  Will it happen? Absoutly, when? Dunno.
125807
chec out the tsunami that hit Acheh
41564
How are tsunamis generated?          \n\nTsunamis are generated by any large, impulsive displacement of the sea level. \nTsunamis are also triggered by landslides into or under the water surface, and can be generated by volcanic activity and meteorite impacts.
219810
It's nothing to do with the moon. When any wave reaches the shore, it slows down, piles up higher and higher, and if you observe carefully you will see it draws some of the water in front of it backwards to help fill the wave crest before it breaks. The same thing happens on a very much larger scale in a tsunami. The "tide goes out", then comes back with a vengeance. Since tsunamis can consist of more than one wave, this out-in cycle may repeat a few times.
22991
A series of waves that were displaced on a mega huge scale generally caused by earthquakes or meteor impact. Tsunami is Japanese for harbor wave, due to the fact that tsunamis are not tidal waves but have a much smaller crest therefore goes, for the most part visually unnoticed. As far as the effects we saw that one of the islands that were devastated during the last major one in Asia was moved 100 feet? beyond where it was originally located and according to NASA actually disrupted the rotation of the earth.
387651
Tsunamis fall into a wave physics category called long waves, also known as shallow water waves.  This type of wave is characterized by a wavelength that is much larger than the water depth.  In the case of tsunamis, their wavelength might be 500 km versus, for example, a 4 km ocean depth, so even though 4 km is "deep", the waves are technically "shallow water waves".\n\nAccording to the sources I have included below, the velocity of shallow water waves does in fact vary according to the water depth.  According to the NOAA site, "The speed of a shallow-water wave is equal to the square root of the product of the acceleration of gravity (32ft/sec/sec or 980cm/sec/sec) and the depth of the water."  Therefore, the longer the wavelength, the faster the wave.  Since tsunamis have very large wavelengths, their speed is large.\n\nThe ripples on a pond that we're all so familiar with are technically short waves, or deep water waves, because the wavelength of the waves is not substantially larger than the depth of the water.  In this situation, the wave velocity is relatively constant for the wavelengths we typically see on the surface of a pond or bathtub, but according to the sources below, the wave speed does in fact vary according to the wavelength of the waves.\n\nYou are correct that the speed of a wave is constant in a given medium.  However, as you suspected after you lost the bet, tsunamis and ripples are effectively traveling through different media because of the ratio of their wavelengths to the water depth.
540531
The threat of a tsunami was forecast if a large part of the Azores broke away and fell into the sea. Apparently, part of a dormant volcano is crumbling and is at risk of shearing away. This action is believed to be large enough to cause a tsunami that will reach both sides of the Atlantic.
695078
TSUNAMI UNITED THE WORLD.\n\nTHIS IS THE BIGGEST EXAMPLE YOU HAVE GOT.\nBUILD UP ON THIS..CHEERS!
42373
The formation of tropical cyclones (hurricanes) is the topic of extensive ongoing research, and is still not fully understood, however, there is a reasonably good article here to read up on current theories...\n\nhttp://en.wikipedia.org/wiki/Hurricane
376504
Tsunamis and hurricanes are some of the most devastating and ruinous natural diasters known to man, necxt to earthquakes.\nWe saw how strongly tsunamis can effect developing countries when the 2004 tsunami hit. not only did it kill many people, it also destroyed homes and left people hungry and shivering all over that area. Hurricanes also have a huge effect on such countries- there was a hurricane a few years ago that destroyed a small part of India, including a bridge that fell and took some lifes with it.\nAs for developed countries, tsunamis have a lttle less effect on them- the US has monitors all along it's shores to warn it against tsunamis, thus making the number of injured/ killed people during tsunamis drop. As for hurricanes, we all heard about Katrina, and how it destroyed a large part of the southern USA, including New Orleans.\nThese disasters also have a very big impact on a countries political, social and economics. After a natural diaster strikes, the political part of a country is sometimes shattered, because everyone blames the president or prime minister for not warning people in time. Also, the government has to drop everything and start helping people in the country, and also find a way to stop future disasters. as for an impact ona countrie's social standards, we saw how the US came to the help of the people who were injured or left homeless after the tsunami, and this helps a country find out who are its friends, and who's not.  As for economic, the repairs for the country  cost a fortune, so that not all countries can afford to fix everything. also, after katrina hit, the oil prices soared up, something that affects countries all over the world.\nIn conclusion, we see that these natural disasters are still very hard to control, even for a very developed country like the Usa, and the results are always devastating.
265966
Waves are normally created by wind!\n\nAdditionally, just like the earth, even the moon has gravity... Its the moon's gravity that pulls the sea water towards it, and "creates" waves!
1119271
Tsunamis and earthquakes we can do nothing about. They are what we call "acts of God". We cannot control them. \n\nWhat we can control is how we behave when they occur. We can be compassionate. We can be understanding. We can open our hearts and hands and help.\n\nWe need to learn more about the world we live in. It is actually a big world despite the fact that the Internet and telephones and televisions connect us so easily. But when we are miles away from the earthquake, when it happens, or if we just cannot get there when a hurricane hits or a tsunami happens, then we can only watch in awesome desperation.\n\nThe world is still growing and changing. Just like people are growing and changing. We just haven't gotten to the point when we can be there to help the moment horrible things happen.\n\nIf we could, we would. No matter what country we are from.\n\nPeople basically want to help out and be a brother to a person across the world from them. Most of the time, they just do not know how to do that well.
518508
Please visit the following websites :\nhttp://www.ess.washington.edu/tsunami/\nhttp://en.wikipedia.org/wiki/Tsunami\nhttp://www.google.com/tsunami_relief.html \nYou'll get most of the answers you seek !
15155
The last years Tsunami was cause by the 2 plates breaking underneath the Phi Phi islands @ 8 15am. It caused the ground to rise up to 40 feet for 750 miles, which  cause an earthquake of 9.5 on the scale. They are predicting that the next country to be hit with a Tsunami is Samaliya.  And US is next... Oregon, Washington and all NW states, BEWARE.  AMERICA'S TSUNAMI, ARE WE NEXT? When they cannot predict, however, they say it might be in the next 1000 years or it might happen tommorow.
68767
A tsunami is the movement of the entire water column from the floor of the sea to the surface.  In deep water, the visible effect may be as little as a surge in the surface.  A tsunami may pass under a ship without the ship even being aware of it.\n\nThe destructive effects of a tsunami do not occur until the ocean floor becomes shallow causing the water column to pile up and become the large wave that is associated with tsunamis.