What Causes Seismic Waves?

Answer

Seismic waves are caused by earthquakes. The earthquakes must occur underneath or near the ocean, be large and create movements in the sea floor to generate the seismic wave. They can be caused by submarine landslides or infrequently by submarine volcanic eruptions and rarely by the impact of a large meteorite in the ocean.
Q&A Related to "What Causes Seismic Waves"
Seismic waves are those caused by earthquakes and which move through the crust of the Earth after tectonic plates have released huge amounts of energy.
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The hard crust of the Earth floats on top of a layer of molten rock, known as magma. When the crust of the Earth moves, it creates vibrations known as seismic waves, according to
http://www.ehow.com/facts_7598605_seismic-wave-mac...
a wave produced by an earthquake wich epicenter is located directly below the sea.
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The seismic velocity in Earth increases with depth and refraction of waves
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1 Additional Answer
Seismic waves are formed from sound waves that radiate outward when an earthquake ruptures. There are two types of wave activity. They are Compressional waves and P waves. You can find more information here: http://www.seismo.unr.edu/ftp/pub/louie/class/100/seismic-waves.html
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