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"
The tectonic plates moving, transform.
http://wiki.answers.com/Q/What_caused_the_Jiajing_...
Tectonic plates colliding can cause an earthquake, but mostly it is two plates rubbing against each other and then scraping because of jagged edges. The abrasion causes vibrating
http://wiki.answers.com/Q/What_causes_tectonic_ear...
voodoolism
http://wiki.answers.com/Q/What+was+the+cause+in+ha...
"Plate tectonics" is what causes an earthquake What is an earthquake: Earthquakes are tremors or vibrations in the Earth's crust that are caused by the build up or accumulation
http://wiki.answers.com/Q/Why+earth+quake+happen
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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