Earthquakes in the United States — September 2026

13 earthquakes were recorded in the United States during September 2026, an average of 0.4 per day.

0 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 15 km.

The month's largest event in the United States was a magnitude 2.5 earthquake near Petrolia, United States on 01 September 2026 at 01:07 UTC. A magnitude 2.5 earthquake radiates roughly 82 kg of TNT equivalent in seismic energy.

That is below the the United States monthly average of 6930 events over the period we cover — a comparatively quiet month, and down from the 7858 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 2 in the magnitude 0 range, 8 in the magnitude 1 range, 3 in the magnitude 2 range.

Activity peaked on 01 September, when 13 events were recorded.

The month's largest events were M2.5 near Petrolia, United States on 01 September at 20 km; M2.1 near Petersville, United States on 01 September at 91 km; M2.0 near Pāhala, United States on 01 September at 30 km.

That is 100% below the 6930 events the United States averages per month across the 22 months on record.