Fault Lines in North America
Here is a map of seismic hazards for the United States from the United States Geological Survey. Link.



Link to interactive fault map for the US (source: USGS)
Here is a link to a nice article on top 5 earthquake prone areas outside California.

It is presence of fault zones, geological structures (like volcanos, subduction zones, tectonic plate junctions, basins, and mountains), geological evidence of past events, and record of earthquake events that go into the calculation of a seismic hazard for a specific region.