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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.

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

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden ... When the rocks break, the earthquake occurs. During the ...

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

These are smaller earthquakes that occur afterwards in the same place as the mainshock. Depending ... What causes earthquakes and where do they happen?

www.fema.gov/why-earthquakes-occur

Dec 23, 2015 ... Such movements occur along faults, which are thin zones of crushed rock separating blocks ... What are earthquakes and why do they occur?

www.iris.edu/hq/inclass/fact-sheet/why_do_earthquakes_happen

In general, earthquakes occur when plates move under, over, or slide past each other. The plates are moving in millimeters per year--about as fast as your ...

www.ask.com/youtube?q=How+Do+Earthquakes+Occur%3F&v=T0AEtX-uPLA
Sep 5, 2012 ... This is a social science video that answers - What is earthquake? ... How does Earthquake occur with explanation - Social Science 3D ...

www.americangeosciences.org/critical-issues/faq/why-and-where-do-earthquakes-happen

Why do earthquakes happen? The rocks that make up the crust of the Earth are full of fractures. On some of these fractures – known as faults – rocks slip past ...

earth.rice.edu/mtpe/geo/geosphere/hot/3earthquakes.html

Earthquakes are the phenomena experienced during sudden movements of the Earth's crust. Under the Earth's crust lies the asthenosphere, the upper part of ...

www.whatcausesearthquakes.com/how-do-earthquakes-happen.htm

The question of how do earthquakes happen is certainly a very interesting question especially if you live in a region prone to earthquakes. It is true that ...

eschooltoday.com/natural-disasters/earthquakes/how-do-earthquakes-occur.html

Earthquakes form when techtonic plates move against each other as a result of pressure caused ... How does an earthquake occur ... How do earthquakes form?