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Of or pertaining to the natural phenomenon when tectonic plates slide or move causing the Earth's surface also move which causes devastating damage to cities and towns.

Contributors in Earthquake


Design acceleration

Natural environment; Earthquake

The anticipated ground acceleration at a site used for earthquake-resistance design of a structure.

Ground motion and ground response

Natural environment; Earthquake

General terms referring to the quantitative or qualitative motion of the earth's surface produced by earthquakes or explosions.

Design earthquake

Natural environment; Earthquake

The largest earthquake that has a high enough probability of occurring at a site that it is appropriate to design a structure to withstand it.

Group velocity

Natural environment; Earthquake

The velocity with which most of the energy in a wave train travels.

Dilatancy (rock)

Natural environment; Earthquake

The increase in volume of rock due to a change in strain.

Hertz (Hz)

Natural environment; Earthquake

A unit of frequency, equal to the number of cycles per second. See frequency.


Natural environment; Earthquake

The angle of a fault or other planar geologic feature relative to horizontal.

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