Was there an earthquake so powerful thatit caused the mississippi river to flownorth instead of south,if so when did it happen and how powerful was it?

In 1812, there were 4 earthquakes (magnitude-7.0) that were so powerful in the area of the New Madrid that caused the Mississippi River to run backwards.
Updated on Monday, February 06 2012 at 03:11PM EST
Collections: mississippi riverearthquake