Shake it baby

A moderate earthquake that rattled parts of Arkansas and Tennessee Thursday should serve as a wake-up call to the central United States about the potential for much stronger events, experts said.

The infamous series of three New Madrid(MO) quakes in 1811-1812 occurred a few weeks apart, from Dec. 16 to Feb. 7. They measured 8.1, 8.0 and 7.8 and represent three of the four strongest earthquakes ever recorded in the lower 48. ...continue