Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey points out that an event may be on the order of days, weeks, or months. They are differentiated from earthquakes ...
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http://en.wikipedia.org/wiki/Earthquake_swarm
(from the article `earthquake`) ...sufficiently strong (up to Richter magnitude 5) to cause property damage but no casualties. The maximum frequency was 6,780 small earthquakes on ...
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http://www.britannica.com/eb/a-z/e/3
A series of minor earthquakes, none of which may be identified as the main shock, occurring in a limited area and time.
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https://www.encyclo.co.uk/local/23001
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