= Ground motion
{wiki=Ground_motion}
Ground motion refers to the movement of the Earth's surface during events such as earthquakes, volcanic activity, or other geological processes. This movement can be measured in terms of its amplitude, frequency, and duration, and it can vary significantly depending on the characteristics of the seismic source, the distance from the source, and the geological properties of the area through which the seismic waves travel. Ground motion is typically quantified using accelerometers or seismometers, which record the acceleration, velocity, or displacement of the ground.
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