The one in Missouri is the New Madrid Fault , and not only did the river run backwards the land had liquid-faction and the soil became like water . And the quake rang the church bells in Boston Mass .
About a week before the quake the ground became so hot that they could hardly walk on it.
And the USGS has stated that the fault is on a 200 or so year cycle and it is due to slip again.
Realfoot lake in I think Ky was formed by the quake as the river changed course by a few miles .
It will be a real house shaker when it goes ! And they say that the last one was a 9.5 on the scale !
St Louis, Memphis , Chicago all those city's will have major damage as it is said. There is a write up about this quake and what they think will happen when it happens again on one of their sites .