Colorado vs Idaho Earthquake Risk

Idaho has a higher earthquake risk with a score of 6/10 (Moderate-High) compared to Colorado at 4/10 (Moderate). This means Idaho faces more frequent and potentially more destructive seismic events.

Colorado averages approximately 50 earthquakes per year, while Idaho averages about 100 per year. Idaho experiences roughly 50 more earthquakes annually.

Colorado is associated with Rio Grande Rift. Idaho is associated with Lost River, Lemhi, Beaverhead faults. These fault systems determine the type and frequency of seismic activity each state experiences.

In Colorado, approximately 25% 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.

Colorado's most notable earthquake: 1882 Northern Colorado (M6.6). Idaho's most notable earthquake: 1983 Borah Peak (M6.9). These historical events illustrate the seismic potential of each state.