Earthquakes in Puerto Rico — August 2026

158 earthquakes were recorded in Puerto Rico during August 2026, an average of 5.1 per day.

1 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 4.2 earthquake near San Antonio, Puerto Rico on 30 August 2026 at 05:47 UTC. A magnitude 4.2 earthquake radiates roughly 30 tons of TNT equivalent in seismic energy.

That is close to the Puerto Rico monthly average of 176 events over the period we cover, and down from the 266 recorded the previous month.

92% of events here are shallow (under 70 km), 8% 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 13 in the magnitude 1 range, 104 in the magnitude 2 range, 40 in the magnitude 3 range, 1 in the magnitude 4 range.

Activity peaked on 04 August, when 11 events were recorded.

The month's largest events were M4.2 near San Antonio, Puerto Rico on 30 August at 35 km; M4.0 near San Antonio, Puerto Rico on 30 August at 53 km; M3.7 near Pole Ojea, Puerto Rico on 14 August at 5 km.

That is 10% below the 176 events Puerto Rico averages per month across the 23 months on record.