Earthquakes in Puerto Rico — August 2025

185 earthquakes were recorded in Puerto Rico during August 2025, an average of 6.0 per day.

2 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 21 km.

The month's largest event in Puerto Rico was a magnitude 4.4 earthquake near San Antonio, Puerto Rico on 22 August 2025 at 16:28 UTC. A magnitude 4.4 earthquake radiates roughly 60 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 189 recorded the previous month.

94% of events here are shallow (under 70 km), 6% 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 24 in the magnitude 1 range, 126 in the magnitude 2 range, 33 in the magnitude 3 range, 2 in the magnitude 4 range.

Activity peaked on 08 August, when 13 events were recorded.

The month's largest events were M4.4 near San Antonio, Puerto Rico on 22 August at 29 km; M4.3 near San Antonio, Puerto Rico on 22 August at 10 km; M3.8 near Rincón, Puerto Rico on 30 August at 142 km.

That is close to the 173 events Puerto Rico averages per month across the 21 months on record.