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seismicity
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seismicity

geology
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History

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 regionā€”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.