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.
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
Q&A Related to "What Causes Seismic Waves"
Seismic waves are caused by the movement of tectonic plates in the Earth's crust, against each other. The plates will sometimes become stuck with each other and when they get loose,
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Seismic waves are mostly caused by earthquakes, although they can also be created by explosions - something that is mainly used in geological research.
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Earth's crust is composed of many huge, rocky plates known as tectonic plates. These
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Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion or a sharp impact (as used in petroleum exploration). The waves result
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