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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.

USGS FAQs - Earthquakes and Plate Tectonics - What is an ...

www2.usgs.gov/faq/categories/9827/3343

An earthquake is caused by a sudden slip on a fault. The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the ...

The Science of Earthquakes - USGS Earthquake Hazards Program

earthquake.usgs.gov/learn/kids/eqscience.php

Apr 7, 2016 ... An earthquake is what happens when two blocks of the earth suddenly slip past one ... What causes earthquakes and where do they happen?

Why Do Earthquakes Happen?

www.geo.mtu.edu/UPSeis/why.html

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ...

The Causes of Earthquakes - SOEST - University of Hawaii

www.soest.hawaii.edu/GG/ASK/earthquakes.html

Subject: What causes earthquakes? What causes earthquakes? The short answer is that earthquakes are caused by faulting, a sudden lateral or vertical ...

www.ask.com/youtube?q=What Causes an Earthquake?&v=FIgksa3x11w
May 3, 2015 ... Check out our channel FunScienceDemos: https://www.youtube.com/user/ funsciencedemos Jared demonstrates how the earth's plates move, ...

What Causes an Earthquake? Faults Explained

news.nationalgeographic.com/news/2014/01/140115-earthquakes-california-faults-science/

Jan 15, 2014 ... What was that you felt? Faults deep underground produce different kinds of earthquakes.

What causes an Earthquake? - The Geography Site

www.geography-site.co.uk/pages/physical/earth/cause.html

There are two main causes of earthquakes. Firstly, they can be linked to explosive volcanic eruptions; they are in fact very common in areas of volcanic activity ...

earthquake: Causes of Earthquakes - Infoplease

www.infoplease.com/encyclopedia/science/earthquake-causes-earthquakes.html

Causes of Earthquakes Most earthquakes are causally related to compressional or tensional stresses built up at the margins of the huge moving.

What is an Earthquake? - Geoscience Australia

www.ga.gov.au/scientific-topics/hazards/earthquake/basics/what

Earthquakes are the vibrations caused by rocks breaking under stress. The underground surface along which the rock breaks and moves is called a fault plane.