For those of you that follow this blog, you know everything about the subsurface interests me.  The New Madrid Fault caused the mighty Mississippi River to change its direction from south to north for a day or so.  Legend says that it was responsible for creating Caddo Lake in northwest Louisiana and east Texas.  If a quake of the same magnitude occurred today, it would result in death and devastation beyond what anyone in this country has ever experienced.  http://www.ericwilder.com

Source of Major Earthquakes Discovered Beneath U.S. Heartland - Yahoo! News