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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.

en.wikipedia.org/wiki/Earthquake

An earthquake is the shaking of the surface of the Earth, resulting ... Most fault surfaces do have such asperities and this leads to a form of stick-slip behavior. Once the fault has locked, ...

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.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 ...

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

Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust (the outer layer of the planet) is made up of several pieces, called ...

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

On average, Magnitude 2 and smaller earthquakes occur several hundred times a day world wide. Major earthquakes, greater than magnitude 7, happen more ...

www.bgs.ac.uk/discoveringGeology/hazards/earthquakes/whyWhere.html

If we look at the pattern of where earthquakes occur around the world, it is clear that most of the earthquake activity ... Do earthquakes and volcanoes coincide?

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.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.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 ...