If the New Madrid Fault had a massive earthquake...?

Question

then would any mountains come of it?

Answer 1

No single earthquake is sufficient to create a mountain. Only repeated earth movements over a long time can raise land enough to create mountains. A big earthquake only moves the land on the order of meters, not hundreds or thousands of meters. You should look up images of places hit by big earthquakes, like Anchorage Alaska in 1964, to see what I mean.

Answer 2

There really isn't a fault associated with it but a series of rifts or normal faults. Mountain building is associated with thrust faults, not normal faults. So no there will be no mountain building, or at least not any of consequence.

Its a seismic zone thought to be reactivated by the movement of an old plate that has subducted beneath the North American plate.

Answer 3

Depends on what type of fault it is. I think it is a strike slip fault (which moves left to right or right to left). The other fault is a dip slip fault (which one side raises or drops below the other side). Dip slip will create mountains.