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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.

Earthquake - Wikipedia

en.wikipedia.org/wiki/Earthquake

An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of ... Earthquakes are caused mostly by rupture of geological faults, but also by other events such as vol...

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 Is Causing Earthquakes?&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 earthquakes? - Geoscience Australia

www.ga.gov.au/earthquakes/staticPageController.do?page=about-earthquakes/what-causes-an-earthquake

What causes Earthquakes. The Earth's outer layer or crust is broken into pieces called tectonic plates which are constantly moving towards, away from or past ...

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.

What causes earthquakes? - Explain that Stuff

www.explainthatstuff.com/earthquakes.html

Sep 13, 2016 ... An easy-to-understand explanation of what causes earthquakes, how they move through Earth, and how we can protect buildings and people ...