Earthquakes in the United States — September 2025

7093 earthquakes were recorded in the United States during September 2025, an average of 236.4 per day.

51 reached magnitude 4 or above and 18 reached magnitude 5 or above. The average focal depth was 13 km.

The month's largest event in the United States was a magnitude 6.0 earthquake near Nikolski, United States on 03 September 2025 at 20:57 UTC. A magnitude 6.0 earthquake radiates roughly 15,080 tons of TNT equivalent in seismic energy.

That is close to the the United States monthly average of 7168 events over the period we cover, and down from the 7334 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 9 in the magnitude -2 range, 370 in the magnitude -1 range, 2097 in the magnitude 0 range, 3554 in the magnitude 1 range, 836 in the magnitude 2 range, 174 in the magnitude 3 range.

Activity peaked on 17 September, when 354 events were recorded.

20 event(s) this month carry a USGS link to NOAA tsunami information; the flag does not indicate whether a tsunami occurred.

The month's largest events were M6.0 near Nikolski, United States on 03 September at 10 km; M5.9 near Bandon, United States on 26 September at 10 km; M5.9 near Bandon, United States on 26 September at 14 km.

That is close to the 7168 events the United States averages per month across the 21 months on record.