Here’s a geographic resource that can be used to reveal the area around the New Madrid fault.
Go to the site and start clicking around the bootheal of Missouri.
As you zoom in on the area, it will become evident what I was addressing in my post to you, mountainous areas with large areas of smooth sedimentary plains in between.
A geologist might be able to tell you why liquifaction might not be a danger on these plains, but it sure looks like that might be a problem to me.
http://www.shadedrelief.com/physical/
it is a problem already
this site writes about it
http://www.showme.net/~fkeller/quake/liquefaction.htm
A Tour through the New Madrid Seismic Zone
http://www.showme.net/~fkeller/quake/tour.htm#littleprairie