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Natural environment

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

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Natural environment > Earthquake

foreshocks

Natural environment; Earthquake

Smaller tremor preceding the main earthquake in a series.

free field

Natural environment; Earthquake

Ground motion measurements that are not influenced by constructed structures.

capable fault

Natural environment; Earthquake

An active fault or fault zone that has the potential to cause surface displacement during the lifetime of a project under consideration.

frequency

Natural environment; Earthquake

The number of cycles occurring in a unit time.

fundamental period

Natural environment; Earthquake

The longest period of ground motion for which a structure shows a maximum response.

complex faults

Natural environment; Earthquake

A series of faults that may tilt rocks in many different directions.

geodesy

Natural environment; Earthquake

The study of the shape and size of the earth.

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