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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Earthquake 
alluvium
Natural environment; Earthquake
Loosely compacted sand, gravel, and silt deposited by streams in relatively recent geologic time.
amplification (seismic)
Natural environment; Earthquake
The increase in surface ground motion at certain frequencies in unconsolidated sediments relative to the motion in solid rock.
strike-slip fault
Natural environment; Earthquake
A fault on which the movement is parallel to the fault's strike.
maximum credible earthquake
Natural environment; Earthquake
The largest earthquake, usually expressed in magnitude, judged to be possible in an area.
thrust or overthrust fault
Natural environment; Earthquake
A dip-slip fault in which the upper block moves over the lower block. The dip of some thrust faults is low and the displacement may be tens of miles.
mercalli scale
Natural environment; Earthquake
A measure of an earthquake’s intensity, ranging from 1 to 12.
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)