In 4-28-2003 we had a 4.9 earthquake here in Alabama. Centered just a few miles from my house. Largest earthquake in Alabama modern history, and it was pretty scary. All the alarms went off in town, I thought a tree had hit the house, it cracked my chimney pretty bad. Most all the brick homes in the area received some crackage.
I can't fathom what a 7.0 earthquake would do to this area.