Earthquakes in Puerto Rico — August 2026

118 earthquakes were recorded in Puerto Rico during August 2026, an average of 3.8 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 3.7 earthquake near Pole Ojea, Puerto Rico on 14 August 2026 at 12:28 UTC. A magnitude 3.7 earthquake radiates roughly 6.1 tons of TNT equivalent in seismic energy.

That is below the Puerto Rico monthly average of 173 events over the period we cover — a comparatively quiet month, and down from the 266 recorded the previous month.

93% of events here are shallow (under 70 km), 7% 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 10 in the magnitude 1 range, 78 in the magnitude 2 range, 30 in the magnitude 3 range.

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

The month's largest events were M3.7 near Pole Ojea, Puerto Rico on 14 August at 5 km; M3.6 near Guánica, Puerto Rico on 07 August at 16 km; M3.6 near Stella, Puerto Rico on 13 August at 104 km.

That is 32% below the 173 events Puerto Rico averages per month across the 21 months on record.