The displacement in a tsunami creates a wave which is very long – up to 200 km (125 miles). There is nothing physically unusual about tsunamis, they are normal waves, but their features are awesome. 2. Indonesian officials estimated that the death toll there alone ultimately exceeded 200,000, particularly in northern Sumatra’s Aceh province. As the tsunami hits shallower water, the velocity slows, wavelength decreases and the waves height (amplitude) increases. A tsunami is short enough to have a rapid effect, in minutes, but long enough to carry enormous energy.

What Happens During a Tsunami? What happens to the water before the tsunami hits land? Tsunami waves can grow up to 30 meters in height as they hit the shoreline and are followed by more waves that may even be more dangerous. I’m surprised so many people still think tsunamis look like this: When they actually look like this: A tsunami is not a wave like you or I are accustomed to. Tsunamis also destroy vast tracts of infrastructure and property. As a tsunami approaches shore, we've learned in the "What happens to a tsunami as it approaches land?" The tsunami killed at least 225,000 people across a dozen countries, with Indonesia, Sri Lanka, India, Maldives, and Thailand sustaining massive damage. When a tsunami occurs, it's typically in response to an earthquake, and oceanic waves grow to large proportions, increasing their rate of causing damage.

Houses, trees and people don’t stand a chance as the water rushes through. Tsunamis claimed more 255,000 lives between 1900 and 2009, including the tsunami that originated off Sumatra on December 26, 2004, which killed more than 225,000 people. Furthermore, if the trough of the tsunami wave hits the shore first, it can be even more devastating, as the water will pull back much further than normal and then come back with a powerful, towering wave that breaks inland.
As a tsunami approaches shorelines, water may recede from the coast, exposing the ocean floor, reefs and fish. What Happens When It Hits Land A tsunami’s trough, the low point beneath the wave’s crest, often reaches shore first.

Severe ground shaking from local earthquakes may cause tsunamis. Furthermore, if the trough of the tsunami wave hits the shore first, it can be even more devastating, as the water will pull back much further than normal and then come back … Other natural earth forces can cause tsunamis as well, including meteorites, landslides, explosions and a volcano erupting, according to the Australian Bureau of Meteorology or BOM. Damages are caused. Learn how to turn off the gas and electricity in your house. In a tide the wave is so long that this happens slowly, over a few hours. If an area has been shaken by a very large earthquake, one should be on alert that shorelines located within the radius of the earthquake's epicentre, may be hit by a tsunami.

That depends where the tsunami is, if its far out, nothing happens. The most terrible and immediate human aftermath of a tsunami is loss of life.

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