Earthquakes in September 2025: 8,103 Recorded Worldwide

8,103 earthquakes were recorded worldwide in September 2025, an average of 270 per day.

That is essentially level with the 8,167 recorded in the preceding period — global seismicity is remarkably steady from one month to the next.

The largest event of September 2025 was a magnitude 7.8 earthquake near Petropavlovsk-Kamchatsky, Russia on 18 September, at a focal depth of 20 km. A magnitude 7.8 earthquake radiates roughly 7.6 million tons of TNT equivalent in seismic energy.

By band, September 2025 produced 9 in the magnitude -2 range, 370 in the magnitude -1 range, 2102 in the magnitude 0 range, 3606 in the magnitude 1 range, 959 in the magnitude 2 range, 259 in the magnitude 3 range.

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.

The busiest single day was 17 September 2025, with 373 recorded events.

Most active: the United States (7093), Russia (261), Puerto Rico (121), Mexico (73), Indonesia (59).