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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Earthquake 
microzonation
Natural environment; Earthquake
Delineation on a local scale of areas having different potentials for the hazardous effects of earthquakes.
fault-plane solution
Natural environment; Earthquake
The use of seismic waves radiating from an earthquake and recorded at several stations to determine the attitude of a fault producing an earthquake and the direction of slip.
mohorovicic (moho) discontinuity
Natural environment; Earthquake
The boundary between the crust and upper mantle usually identified by an increase in the velocity of propagation of seismic waves.
moment (earthquake)
Natural environment; Earthquake
A measure of the energy released in an earthquake determined by strength of the fault and the area and amount of slip.
natural frequency
Natural environment; Earthquake
The frequency at which an elastic system vibrates when set in motion by a single pulse.
normal faults
Natural environment; Earthquake
A fault in which blocks of rock slip straight down; also called dip-slip faults.
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