en.wikipedia.org/wiki/Earthquake

An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves.

earthquake.usgs.gov/earthquakes/map

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

An earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane.

earthquake.usgs.gov

USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards.

www.ready.gov/earthquakes

An earthquake is the sudden, rapid shaking of the earth, caused by the breaking and shifting of underground rock. Earthquakes can cause buildings to collapse ...

www.ready.gov/kids/know-the-facts/earthquakes

Earthquakes are the shaking, rolling or sudden shock of the earth's surface. Earthquakes happen along cracks (called fault lines) in the earth's surface.

www.britannica.com/science/earthquake-geology

May 15, 2019 ... Earthquake: Earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth's rocks. Earthquakes occur ...

www.nationalgeographic.com/environment/natural-disasters/earthquakes

May 9, 2019 ... Earthquakes are naturally destructive effects of our planet's constantly changing surface, and thousands of them happen every day.

www.sciencedirect.com/topics/earth-and-planetary-sciences/earthquake

Earthquakes do not occur to the same extent all over the globe. The major events are largely concentrated at the boundaries of tectonic plates, and the ...