What Causes a Earthquake?

Answer

An earthquake is described as a sudden movement or tremor of the crust of the earth which originates from under or on top of the surface. The two major causes of earthquakes are explosive volcanic eruptions and tectonic activities related to plate faults and margins.
Q&A Related to "What Causes a Earthquake"
Earthquakes are caused by the movement of tectonic plates. Earthquakes occur mostly at fault lines, or the places where the plates meet.
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Earthquakes are tremors or vibrations in the Earth's crust that are caused by the build up or accumulation of pressure (more correctly termed stress) This accumulation of stress causes
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In a very general sense all earthquakes have the same cause. They are caused by the release of stress in the earth's crust. the higher the stress the more potential for movement.
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Seismology is the study of earthquakes. Seismologists research all earthquake activity that happens and they study the mechanical properties of the earth as well.
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2 Additional Answers
Ask.com Answer for: what causes a earthquake
Earthquakes are caused by an abrupt shift of rock along a fracture in the Earth.
Most earthquakes are caused by slow movements inside the Earth that push against the Earth's brittle, relatively thin outer layer, causing the rocks to break suddenly.
The movement of two of the Earth's plates, or layers, is what causes an earthquake. The two plates move and either run into each other or slide past each other. You can find more information here: http://earthquake.usgs.gov/learn/kids/eqscience.php
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