Idaho vs Wyoming Earthquake Risk

Idaho and Wyoming share the same risk score of 6/10 (Moderate-High). Both states face similar levels of seismic hazard, though the specific fault systems and earthquake characteristics differ.

Idaho averages approximately 100 earthquakes per year, while Wyoming averages about 2,000 per year. Wyoming experiences roughly 1,900 more earthquakes annually.

Idaho is associated with Lost River, Lemhi, Beaverhead faults. Wyoming is associated with Teton Fault, Yellowstone volcanic zone. These fault systems determine the type and frequency of seismic activity each state experiences.

In Idaho, approximately 45% of the population lives in areas at risk from earthquakes, compared to 40% in Wyoming. Idaho has a larger percentage of residents exposed to seismic hazard.

Idaho's most notable earthquake: 1983 Borah Peak (M6.9). Wyoming's most notable earthquake: 1959 Hebgen Lake (nearby, M7.3). These historical events illustrate the seismic potential of each state.