(UTC) 

 ::::That's just hyperbole. The New Madrid quakes were big. Nobody knows exactly how big, it depends on your source. There have been other big intraplate earthquakes in the contiguous US, including Charleston (S.C.) and the Hebgen Lake (Montana) earthquake, which was around a 7.5. I deleted the "biggest earthquake" claim from the article as an unprovable assertion.   00:00, 22 April 2010