A 5.7-magnitude earthquake shook Salt Lake City and its suburbs early Wednesday, sending spooked residents fleeing their homes, knocking out power for tens of thousands and closing the city's airport.

Salt Lake City, and most of Utah’s population, sits on one of the largest normal faults in the world, the Wasatch Fault. According to a 2016 report, there’s a 57% chance of a magnitude 6 or greater ...