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 first triggering effect of vibrations in an a margin or fault-type earthquake starts with the sudden release of energy when two tectonic plates snap apart. If the earthquake happens
http://www.ehow.com/info_8469110_causes-vibrations...
The processes of "plate tectonics" are what cause an earthquake. An answer for young students. : Earthquakes are shakes and jiggles in the huge pieces of the Earth that
http://wiki.answers.com/Q/What_causes_earthquakes
I would say that two of the plates were sliding past each other, got stuck, and slipped past each other so fast that it caused pressure rising to the surface, and caused an earthquake
http://wiki.answers.com/Q/The+causes+of+haiti+eart...
earthquakes are usally caused by rocks when they move past each other along a fault,their rough surfaces catch,temporarily halting movement along th fault.however,forces keep driving
http://wiki.answers.com/Q/What_are_earthquakes_cau...
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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