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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Earthquake 
acceleration
Natural environment; Earthquake
The time rate of change of velocity of a reference point during an earthquake. Commonly expressed in percentage of gravity.
accelerogram
Natural environment; Earthquake
The record from an accelerograph showing ground acceleration as a function of time.
accelerograph
Natural environment; Earthquake
A compact, rugged instrument that records the signal from an accelerometer.
accelerometer
Natural environment; Earthquake
An instrument used to measure acceleration. Used to measure the response of the ground or a structure to shaking in an earthquake.
acceptable risk
Natural environment; Earthquake
The probability of social or economic consequences due to a hazard that is a realistic basis for determining design requirements or taking certain social or economic actions.
active fault
Natural environment; Earthquake
A fault along which displacement has occurred in recent geologic time or along which earthquake foci are located. Active faults are assumed to be capable of producing earthquakes.
aftershock
Natural environment; Earthquake
Additional tremors that occur after the initial earthquake.
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
- Climate change (10457)
- Coral reefs (23903)
- Deserts (738)
- Earthquake (7143)
- Flood (34)
- Forests (37)
- Grassland (35)
- Land mass (144)
- Landslide (66)
- Mountains (203)
- Plateau (39)
- Speleology (1857)
- Volcano (5852)
- Water (18527)