An earthquake swarm occurred near Lake Keowee, South Carolina in January to February 1978. The swarm was monitored by using portable seismographs. The shallow (<3 km), low level (ML ≦ 2.2), intense (up to 200 events per day) activity occurred in a narrow elliptical epicentral region (2 by 3 km). This active area trends NW-SE, normal to local geologic grain, and appears to be related to the steeply dipping NE trending joints.

A search for earlier seismicity in the area suggests that this swarm is possibly related to the Seneca earthquake of 1971 which followed the impounding of Lake Keowee.

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