Earthquakes in Tonga — June 2026

22 earthquakes were recorded in Tonga during June 2026, an average of 0.7 per day.

22 reached magnitude 4 or above and 3 reached magnitude 5 or above. The average focal depth was 199 km.

The month's largest event in Tonga was a magnitude 5.4 earthquake near Neiafu, Tonga on 10 June 2026 at 23:30 UTC. A magnitude 5.4 earthquake radiates roughly 1,898 tons of TNT equivalent in seismic energy.

That is close to the Tonga monthly average of 18 events over the period we cover, and up from the 20 recorded the previous month.

45% of events here are shallow (under 70 km), 27% intermediate (70–300 km) and 27% 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 19 in the magnitude 4 range, 3 in the magnitude 5 range.

Activity peaked on 10 June, when 3 events were recorded.

The month's largest events were M5.4 near Neiafu, Tonga on 10 June at 10 km; M5.3 near Neiafu, Tonga on 06 June at 10 km; M5.0 near Hihifo, Tonga on 23 June at 10 km.

That is 19% above the 18 events Tonga averages per month across the 21 months on record.