Earthquakes in Puerto Rico — April 2025

203 earthquakes were recorded in Puerto Rico during April 2025, an average of 6.8 per day.

0 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 22 km.

The month's largest event in Puerto Rico was a magnitude 3.9 earthquake near San Juan, Puerto Rico on 26 April 2025 at 13:07 UTC. A magnitude 3.9 earthquake radiates roughly 11 tons of TNT equivalent in seismic energy.

That is close to the Puerto Rico monthly average of 173 events over the period we cover, and down from the 337 recorded the previous month.

96% of events here are shallow (under 70 km), 4% intermediate (70–300 km) and 0% deep-focus (over 300 km). Almost everything here is crustal. That is characteristic of transform faulting or continental deformation rather than subduction — and it means shaking at the surface is strong for the magnitudes involved.

By band, the catalogue holds 16 in the magnitude 1 range, 131 in the magnitude 2 range, 56 in the magnitude 3 range.

Activity peaked on 26 April, when 33 events were recorded.

The month's largest events were M3.9 near San Juan, Puerto Rico on 26 April at 21 km; M3.8 near Rincón, Puerto Rico on 30 April at 24 km; M3.7 near Vieques, Puerto Rico on 08 April at 59 km.

That is 17% above the 173 events Puerto Rico averages per month across the 21 months on record.