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Seismology
The study of earthquake, seismic sources, and wave propagation through the Earth.
Industry: Earth science
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Seismology
Aftershock
Earth science; Seismology
An earthquake that occurs after a "mainshock" (or larger earthquake). Aftershocks occur in the same general region as the "mainshock" and result from readjustments of stress at places along the fault ...
Arias intensity
Earth science; Seismology
A ground-motion parameter derived from an accelerogram and proportional to the integral over time of the acceleration squared. Expressed in units of velocity (meters per second or centimetres per ...
Precursor
Earth science; Seismology
A change in the geological conditions that is a forerunner to earthquake generation on a fault.
B value
Earth science; Seismology
A coefficient describing the ratio of small to large earthquakes within a given area and time period, often shown to be the same over wide range of magnitudes. It is the slope of the curve in the ...
Normal fault
Earth science; Seismology
A fault characterised by predominantly vertical displacement in which the hanging wall is moved downward with respect to the footwall of the fault. Generally, this kind of fault is a sign of tectonic ...
Travel-time curve
Earth science; Seismology
A graph of travel time verses distance for the arrival of seismic waves from distant events. Each type of seismic wave has its own curve.
Lg wave
Earth science; Seismology
A surface wave which travels through the continental crust. This wave type is the one which causes damage during large Eastern Canadian earthquakes.
