Earthquakes in Guam — September 2025
4 earthquakes were recorded in Guam during September 2025, an average of 0.1 per day.
4 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 56 km.
The month's largest event in Guam was a magnitude 4.8 earthquake near Yigo Village, Guam on 20 September 2025 at 06:49 UTC. A magnitude 4.8 earthquake radiates roughly 239 tons of TNT equivalent in seismic energy.
That is close to the Guam monthly average of 4 events over the period we cover, and down from the 8 recorded the previous month.
75% of events here are shallow (under 70 km), 25% intermediate (70–300 km) and 0% deep-focus (over 300 km). The mix is dominated by shallow crustal events, with a minority of intermediate-depth activity.
By band, the catalogue holds 4 in the magnitude 4 range.
The month's largest events were M4.8 near Yigo Village, Guam on 20 September at 38 km; M4.5 near Yigo Village, Guam on 24 September at 127 km; M4.5 near Inarajan Village, Guam on 02 September at 50 km.
That is close to the 4 events Guam averages per month across the 18 months on record.
Largest earthquakes in Guam, September 2025
4 events listed below, newest first. Times are UTC. Click any column header to re-sort.
| Time (UTC) | Mag | Location | Depth (km) | Country | Details |
|---|---|---|---|---|---|
| 4.8 | Yigo Village, Guam | 37.6 | Guam | View details View | |
| 4.5 | Yigo Village, Guam | 127.1 | Guam | View details View | |
| 4.5 | Inarajan Village, Guam | 49.8 | Guam | View details View | |
| 4.1 | Yigo Village, Guam | 10.0 | Guam | View details View |
Frequently asked questions
How many earthquakes hit Guam in September 2025?
4 earthquakes were recorded in Guam during September 2025, of which 4 were magnitude 4 or above.
What was the biggest earthquake in Guam in September 2025?
A magnitude 4.8 event near Yigo Village, Guam on 20 September 2025.
Other months in Guam
Magnitudes for September 2025 reflect the current USGS review status and may have been revised since first publication. See our guides on the magnitude scale, focal depth and why earthquakes cluster.