Massachusetts vs Puerto Rico Earthquake Risk

Puerto Rico has a higher earthquake risk with a score of 7/10 (High) compared to Massachusetts at 3/10 (Low-Moderate). This means Puerto Rico faces more frequent and potentially more destructive seismic events.

Massachusetts averages approximately 5 earthquakes per year, while Puerto Rico averages about 100 per year. Puerto Rico experiences roughly 95 more earthquakes annually.

Massachusetts is associated with Cape Ann seismic 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 Massachusetts, approximately 10% 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.

Massachusetts's most notable earthquake: 1755 Cape Ann (M6.0). Puerto Rico's most notable earthquake: 2020 Guayanilla (M6.4). These historical events illustrate the seismic potential of each state.