National Earthquake Hazards Reduction Program (NEHRP): Issues in Brief [January 31, 2018] [open pdf - 741KB]
"Portions of all 50 states and the District of Columbia are vulnerable to earthquake hazards, although risks vary greatly across the country and within individual states. Seismic hazards are greatest in the western United States, particularly in California, Washington, Oregon, Alaska, and Hawaii. Alaska is the most earthquake-prone state, experiencing a magnitude-7 earthquake almost every year and a magnitude-8 earthquake every 13 years, on average, since 1900. Because of its low population and infrastructure density, Alaska has a relatively low risk for large economic losses from an earthquake. In contrast, California has more citizens and infrastructure at risk than any other state because of its frequent seismic activity, large population, and extensive infrastructure."
CRS Report for Congress, R43141