aftershock

n. additional tremor, small earthquake that follows a larger earthquake

This article is about the geological event. For other uses of the term see Aftershock (disambiguation). Aftershocks are earthquakes in the same region of the central shock (generally within a few rupture length) but of smaller magnitude and which occur with a pattern that follows Omori's law. Omori's law, or more correctly the modified Omori's law, is an empirical relation for the temporal decay of aftershock rates. Omori published his work on the aftershocks of earthquakes, in which he stated that aftershock frequency decreases by roughly the reciprocal of time after the main shock, in 1894.
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Noun
1. a tremor (or one of a series of tremors) occurring after the main shock of an earthquake
(hypernym) tremor, earth tremor, microseism

A ground tremor caused by the repositioning of rocks after an earthquake. Aftershocks may continue to occur for as long as two years after the initial earthquake. The intensity of an earth quake's aftershocks decreases over time.

aftershock /'ɑ:ftəʃɔk/
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