Montana vs Puerto Rico Earthquake Risk

Puerto Rico has a higher earthquake risk with a score of 7/10 (High) compared to Montana at 6/10 (Moderate-High). This means Puerto Rico faces more frequent and potentially more destructive seismic events.

Montana averages approximately 150 earthquakes per year, while Puerto Rico averages about 100 per year. Montana experiences roughly 50 more earthquakes annually.

Montana is associated with Intermountain Seismic Belt, Lewis & Clark zone. Puerto Rico is associated with Puerto Rico Trench, Mona Passage. 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 95% in Puerto Rico. Puerto Rico has a larger percentage of residents exposed to seismic hazard.

Montana's most notable earthquake: 1959 Hebgen Lake (M7.3). Puerto Rico's most notable earthquake: 2020 Guayanilla (M6.4). These historical events illustrate the seismic potential of each state.