Earthquakes in Timor-Leste — September 2025

11 earthquakes were recorded in Timor-Leste during September 2025, an average of 0.4 per day.

11 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 190 km.

The month's largest event in Timor-Leste was a magnitude 4.8 earthquake near Lospalos, Timor-Leste on 23 September 2025 at 17:08 UTC. A magnitude 4.8 earthquake radiates roughly 239 tons of TNT equivalent in seismic energy.

That is well above the Timor-Leste monthly average of 9 events over the period we cover — an unusually active month, and down from the 13 recorded the previous month.

9% of events here are shallow (under 70 km), 64% 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 11 in the magnitude 4 range.

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

The month's largest events were M4.8 near Lospalos, Timor-Leste on 23 September at 350 km; M4.7 near Manatutu, Timor-Leste on 12 September at 10 km; M4.6 near Lospalos, Timor-Leste on 27 September at 172 km.

That is 27% above the 9 events Timor-Leste averages per month across the 21 months on record.