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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Earthquake 
gravity anomaly
Natural environment; Earthquake
A feature in the gravity field of the earth caused by the distribution of mass in the earth.
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.
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)