Monday 11 November 2013

Causes of Seismic Waves

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 most commonly from sharp releases of energy and the fracturing of rock accompanying fault movement, tectonic plate subduction, or activity within a magma chamber. The waves are the energy that travels through the earth and is recorded on seismographs. It has nothing to do with sound.
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.

Also 

When an earthquake fault line shifts or moves it will send out seismic waves- they are sound waves radiated from the earthquake as it ruptures.
What Causes an Earthquake and Seismic Waves



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