Earthquakes in Guam — May 2025

6 earthquakes were recorded in Guam during May 2025, an average of 0.2 per day.

6 reached magnitude 4 or above and 4 reached magnitude 5 or above. The average focal depth was 47 km.

The month's largest event in Guam was a magnitude 5.9 earthquake near Inarajan Village, Guam on 28 May 2025 at 13:34 UTC. A magnitude 5.9 earthquake radiates roughly 10,676 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 4 recorded the previous month.

83% of events here are shallow (under 70 km), 17% 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 2 in the magnitude 4 range, 4 in the magnitude 5 range.

Activity peaked on 27 May, when 2 events were recorded.

The month's largest events were M5.9 near Inarajan Village, Guam on 28 May at 59 km; M5.8 near Inarajan Village, Guam on 28 May at 59 km; M5.1 near Merizo Village, Guam on 26 May at 10 km.

That is 52% above the 4 events Guam averages per month across the 18 months on record.