Earthquakes in Fiji — September 2025

15 earthquakes were recorded in Fiji during September 2025, an average of 0.5 per day.

15 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 578 km.

The month's largest event in Fiji was a magnitude 4.9 earthquake near Fiji region on 15 September 2025 at 20:29 UTC. A magnitude 4.9 earthquake radiates roughly 338 tons of TNT equivalent in seismic energy.

That is close to the Fiji monthly average of 15 events over the period we cover, and up from the 12 recorded the previous month.

0% of events here are shallow (under 70 km), 0% intermediate (70–300 km) and 100% 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 15 in the magnitude 4 range.

Activity peaked on 06 September, when 3 events were recorded.

The month's largest events were M4.9 near Fiji region on 15 September at 640 km; M4.6 near Levuka, Fiji on 06 September at 550 km; M4.6 near Fiji region on 27 September at 614 km.

That is close to the 15 events Fiji averages per month across the 21 months on record.