Reply #: not so much the east coast

[Occulus]

There are two areas of concern in the Midwest. The worse of the pair is the New Madrid Fault, whose seismic activity stretches from northeastern Arkansas to the northeast, including western Tennessee, southeastern Missouri, and western Kentucky. Its center of activity lies directly on the Mississippi River.

Further northeast is the less-talked-about Wabash Valley zone. Taken together, this hot spot of activity stretches up through half of Indiana.

Honestly, earthquakes are common throughout the continental US and we should from time to time expect mild tremblors such as what we felt today. The New Madrid fault is worrisome because of its proximity to Chicago; if the fault were to 'let go' as it did in 1811-12, Chicago (and a great many small cities and towns across several states) could be severely damaged.

None of our buildings here are hardened against earthquakes. Older brick buildings are especially vulnerable. A 'big one', in the Midwest, would be a Very Bad Thing.