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Natural environment

Related to any physical feature of the earth's natural environment.

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Natural environment > Earthquake

resonance

Natural environment; Earthquake

An increase in the amplitude of vibration of a body when the frequency of shaking is close to the natural frequency of the body.

response spectrum

Natural environment; Earthquake

The peak response of a series of simple harmonic oscillators of different natural frequencies when subjected to a particular earthquake ground motion.

return period

Natural environment; Earthquake

See recurrence interval.

reverse fault

Natural environment; Earthquake

A fault in which one block of rock slides up over another.

rift valley

Natural environment; Earthquake

A huge, trough-shaped valley created by faulting.

rigidity

Natural environment; Earthquake

The angular shear strain produced from applying shear stress to a body. See shear modulus.

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