Earthquakes in Guam — December 2025

5 earthquakes were recorded in Guam during December 2025, an average of 0.2 per day.

5 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 5.7 earthquake near Merizo Village, Guam on 24 December 2025 at 15:00 UTC. A magnitude 5.7 earthquake radiates roughly 5,351 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 level with the 5 recorded the previous month.

100% of events here are shallow (under 70 km), 0% 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 1 in the magnitude 4 range, 4 in the magnitude 5 range.

Activity peaked on 24 December, when 4 events were recorded.

The month's largest events were M5.7 near Merizo Village, Guam on 24 December at 23 km; M5.7 near Merizo Village, Guam on 24 December at 10 km; M5.1 near Merizo Village, Guam on 24 December at 10 km.

That is 32% above the 4 events Guam averages per month across the 19 months on record.