Montana vs Washington Earthquake Risk

Washington has a higher earthquake risk with a score of 8/10 (High) compared to Montana at 6/10 (Moderate-High). This means Washington faces more frequent and potentially more destructive seismic events.

Montana averages approximately 150 earthquakes per year, while Washington averages about 1,000 per year. Washington experiences roughly 850 more earthquakes annually.

Montana is associated with Intermountain Seismic Belt, Lewis & Clark zone. Washington is associated with Cascadia subduction zone, Seattle Fault. These fault systems determine the type and frequency of seismic activity each state experiences.

In Montana, approximately 50% of the population lives in areas at risk from earthquakes, compared to 85% in Washington. Washington has a larger percentage of residents exposed to seismic hazard.

Montana's most notable earthquake: 1959 Hebgen Lake (M7.3). Washington's most notable earthquake: 2001 Nisqually (M6.8). These historical events illustrate the seismic potential of each state.