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Seismic devices record tremors

...on the Richter scale, but Pam Tucker, the county's emergency services director, said the Savannah River Site seismic device showed an aftershock did occur for at least seven seconds. "It's been very educational, I think, for the citizens...

http://chronicle.augusta.com/stories/2005/02/04/met_441786.shtml
Metro | Savannah River Site
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