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Related Topics:
earthquake
aftershock
seismic wave
cryoseism
epicentre

seismicity, the worldwide or local distribution of earthquakes in space, time, and magnitude. More specifically, it refers to the measure of the frequency of earthquakes in a region—for example, the number of earthquakes of magnitude between 5 and 6 per 100 square km (39 square miles).

This article was most recently revised and updated by John P. Rafferty.