An elastic wave generated in the earth by an earthquake or explosion.
An oscillatory disturbance which moves away from some source and transports no discernible amount of matter over large distances of propagation.
A signal which propagates through space, much like a water wave moves through water.
See earthquake risk.
Large block(s) of rock falling under the force of gravity.
An area within which the seismic-design requirements are constant.
An instrument for amplifying and recording the motions of the earth caused by seismic waves.
Scientists who study earthquakes and their causes and results.
The study of earthquakes, earthquake sources, and the propagation of seismic waves.
The sensor that detects the seismic wave energy and transform it into an electric voltage.
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