Arizona vs Idaho Earthquake Risk

Idaho has a higher earthquake risk with a score of 6/10 (Moderate-High) compared to Arizona at 3/10 (Low-Moderate). This means Idaho faces more frequent and potentially more destructive seismic events.

Arizona averages approximately 20 earthquakes per year, while Idaho averages about 100 per year. Idaho experiences roughly 80 more earthquakes annually.

Arizona is associated with Basin and Range faults. Idaho is associated with Lost River, Lemhi, Beaverhead faults. These fault systems determine the type and frequency of seismic activity each state experiences.

In Arizona, approximately 15% of the population lives in areas at risk from earthquakes, compared to 45% in Idaho. Idaho has a larger percentage of residents exposed to seismic hazard.

Arizona's most notable earthquake: 1887 Sonoran (M7.2, felt in AZ). Idaho's most notable earthquake: 1983 Borah Peak (M6.9). These historical events illustrate the seismic potential of each state.