Earthquakes in Argentina — December 2025

14 earthquakes were recorded in Argentina during December 2025, an average of 0.5 per day.

14 reached magnitude 4 or above and 1 reached magnitude 5 or above. The average focal depth was 185 km.

The month's largest event in Argentina was a magnitude 5.6 earthquake near Añatuya, Argentina on 27 December 2025 at 10:40 UTC. A magnitude 5.6 earthquake radiates roughly 3,788 tons of TNT equivalent in seismic energy.

That is close to the Argentina monthly average of 18 events over the period we cover, and down from the 21 recorded the previous month.

14% of events here are shallow (under 70 km), 79% intermediate (70–300 km) and 7% 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 13 in the magnitude 4 range, 1 in the magnitude 5 range.

Activity peaked on 30 December, when 2 events were recorded.

The month's largest events were M5.6 near Añatuya, Argentina on 27 December at 588 km; M4.8 near Serrezuela, Argentina on 21 December at 197 km; M4.7 near Calingasta, Argentina on 20 December at 114 km.

That is 23% below the 18 events Argentina averages per month across the 21 months on record.