An a series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating.

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A wave of energy that is generated by an earthquake or other earth vibration and that travels within the earth or along its surface.

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Earthquakes happen when the boundaries of the Earth's tectonic plates bump and slide past one another; sometimes, they get stuck on jagged edges and cause earthquakes once they are released.

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An earthquake wave in which rock particles vibrate parallel to the direction of wave travel. Primary waves can travel through both solids and liquids.

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excrement

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