Why do tsunamis occur?

Answer

The most common cause of tsunamis is from undersea earthquakes on the ocean floor. Submarine landslides and volcanic eruptions also cause tsunamis. On very rare occasions, a meteorite impact in the ocean results in a tsunami. Any event that displaces a significant amount of water in a short period of time can cause a tsunami.

Not all undersea earthquakes cause tsunamis. The quake must cause part of the crust to lift up like a gigantic paddle, displacing a large volume of water. If the quake happens deep in the crust or the crust is not displaced significantly, then a tsunami is not likely to occur. Strong, shallow quakes produce more tsunamis. Tsunamis are difficult to detect on the open ocean since the wave does not rise very far above the ocean's surface. As the tsunami approaches shallower water, the water piles up and causes a much taller wave.

Volcanic eruptions also cause tsunamis, such as the waves produced when the Indonesian volcano Krakatoa erupted in 1883. Superheated gas and rock from the volcano flowed into the sea, which displaced a huge volume of water and caused tsunamis. These waves were felt as far away as South Africa. Many villages were destroyed by these waves, and more than 36,000 people died.

Q&A Related to "Why do tsunamis occur?"
Tsunamis occur in water bodies, usually where an earthquake or volcano occurs. They become tsunamis when they get close to land.
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The tsunami hit Hawaii about an hour ago, so far there is no major damage but
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A Tsunami is a series of waves, or "wave trains," usually triggered by an earthquake. Vertical Slice Through a Subduction Zone One of the many tectonic plates that make
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The moon has been moving away since the day it was formed but this has nothing what so ever to do with Earthquakes. Tsunamis are not naturally forming they are a result of an event
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1 Additional Answer
Ask.com Answer for: why do tsunamis occur
Tsunami are large waves caused by sudden movement of the ocean due to earthquakes, landslides, large volcanic eruptions or meteorite impact in the ocean.
Most tsunami are caused by large earthquakes on the seafloor when slabs of rock move past each other suddenly, causing the overlying water to move.
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