Earthquakes in Guam — August 2025
8 earthquakes were recorded in Guam during August 2025, an average of 0.3 per day.
8 reached magnitude 4 or above and 4 reached magnitude 5 or above. The average focal depth was 33 km.
The month's largest event in Guam was a magnitude 6.1 earthquake near Yigo Village, Guam on 10 August 2025 at 04:56 UTC. A magnitude 6.1 earthquake radiates roughly 21,301 tons of TNT equivalent in seismic energy.
That is well above the Guam monthly average of 4 events over the period we cover — an unusually active month, and up from the 2 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, 3 in the magnitude 5 range, 1 in the magnitude 6 range.
Activity peaked on 10 August, when 6 events were recorded.
The month's largest events were M6.1 near Yigo Village, Guam on 10 August at 10 km; M5.9 near Yigo Village, Guam on 10 August at 10 km; M5.4 near Yigo Village, Guam on 10 August at 10 km.
That is 103% above the 4 events Guam averages per month across the 18 months on record.
This month also holds the strongest earthquake recorded in Guam in our entire catalogue.
Largest earthquakes in Guam, August 2025
8 events listed below, newest first. Times are UTC. Click any column header to re-sort.
| Time (UTC) | Mag | Location | Depth (km) | Country | Details |
|---|---|---|---|---|---|
| 6.1 | Yigo Village, Guam | 10.0 | Guam | View details View | |
| 5.9 | Yigo Village, Guam | 10.0 | Guam | View details View | |
| 5.4 | Yigo Village, Guam | 10.0 | Guam | View details View | |
| 5.1 | Yigo Village, Guam | 10.0 | Guam | View details View | |
| 4.9 | Inarajan Village, Guam | 10.0 | Guam | View details View | |
| 4.7 | Inarajan Village, Guam | 10.0 | Guam | View details View | |
| 4.7 | Yigo Village, Guam | 119.7 | Guam | View details View | |
| 4.5 | Merizo Village, Guam | 86.7 | Guam | View details View |
Frequently asked questions
How many earthquakes hit Guam in August 2025?
8 earthquakes were recorded in Guam during August 2025, of which 8 were magnitude 4 or above.
What was the biggest earthquake in Guam in August 2025?
A magnitude 6.1 event near Yigo Village, Guam on 10 August 2025.
Other months in Guam
Magnitudes for August 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.