RG 19.1 Forces Within Earth

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Epicenter

The point on Earth's surface directly above the focus.

Secondary Waves

are named with respect to their arrival times.

Elastic Deformation

caused when a material is compressed, bent, or stretched.

Fault

is any fracture or system of fractures along which Earth moves.

Plastic Deformation

when stress builds up past a certain point, called the elastic limit, rocks undergo.

Focus

the point of failure where the waves originate.

Stress

the total force acting on crustal rocks per unit of area.

Seismic Waves

the vibrations of the ground produced during an earthquake.

Primary Waves

squeeze and push rocks in the direction along which the waves are traveling.

Strain

deformation of materials in response to stress.


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