What causes tidal waves?

Answer

Tidal waves, also known as tsunamis, are caused by the displacement of enormous amounts of water in the ocean by an earthquake. When the water is displaced it can form a wave that will increase in height as it appraches the shore, although this is not always the case.
Q&A Related to "What causes tidal waves?"
The earthquake causes a shock-wave under the sea. This causes the water to rush in and fill the gap. But then, the crust snaps back and forces all the water out, plus more. This causes
http://wiki.answers.com/Q/What_is_a_tidal_wave_cau...
Tidal waves are caused not by tides but by underwater disturbances, such as earthquakes, landslides, or volcanic activity. To avoid confusion, many scientists prefer the word tsunami
http://answers.yahoo.com/question/index?qid=201012...
Tidal waves have the potential to be hundreds of feet tall, although most top out
http://www.chacha.com/question/what-is-the-height-...
Longitudinal waves are pressure, or compression, waves. The most common type of longitudinal waves is sound. For example, when a storm produces thunder, the sound wave rattles windows
http://www.ehow.com/info_8515096_causes-longitudin...
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