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from a canadian press aritcle:

"The quake was centred in southern Illinois some 10 kilometres from West Salem, Ill., and about 100 kilometres from Evansville, Ind.

The quake is believed to have involved the Wabash fault, a northern extension of the New Madrid fault about 10 kilometres north of Mt. Carmel, Ill., said geophysicist Randy Baldwin of the U.S. Geological Survey .

The last earthquake in the region to approach the severity of Friday's tremor was a 5.0 magnitude quake that shook a nearby area in 2002, Baldwin said.

"This is a fairly large quake for this region," he said. "They might occur every few years."

Baldwin said the USGS revised the quake's magnitude from 5.4 to 5.2."

Apparently it was felt up in Ontario. Hm.