Alaska vs Puerto Rico Earthquake Risk

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

Alaska averages approximately 12,000 earthquakes per year, while Puerto Rico averages about 100 per year. Alaska experiences roughly 11,900 more earthquakes annually.

Alaska is associated with Alaska-Aleutian subduction zone, Denali Fault. 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 Alaska, approximately 95% 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.

Alaska's most notable earthquake: 1964 Great Alaska (M9.2). Puerto Rico's most notable earthquake: 2020 Guayanilla (M6.4). These historical events illustrate the seismic potential of each state.