Earthquakes in Fiji — December 2025

23 earthquakes were recorded in Fiji during December 2025, an average of 0.7 per day.

23 reached magnitude 4 or above and 5 reached magnitude 5 or above. The average focal depth was 554 km.

The month's largest event in Fiji was a magnitude 5.7 earthquake near Labasa, Fiji on 19 December 2025 at 05:00 UTC. A magnitude 5.7 earthquake radiates roughly 5,351 tons of TNT equivalent in seismic energy.

That is well above the Fiji monthly average of 15 events over the period we cover — an unusually active month, and up from the 17 recorded the previous month.

4% of events here are shallow (under 70 km), 0% intermediate (70–300 km) and 96% deep-focus (over 300 km). That proportion of deep-focus events is the signature of a subduction zone: only a cold slab descending into the mantle stays brittle enough to rupture at those depths.

By band, the catalogue holds 18 in the magnitude 4 range, 5 in the magnitude 5 range.

Activity peaked on 13 December, when 3 events were recorded.

The month's largest events were M5.7 near Labasa, Fiji on 19 December at 10 km; M5.6 near Fiji region on 02 December at 614 km; M5.3 near Fiji region on 04 December at 604 km.

That is 58% above the 15 events Fiji averages per month across the 21 months on record.