Earthquakes in Argentina — September 2026

11 earthquakes were recorded in Argentina during September 2026, an average of 0.4 per day.

11 reached magnitude 4 or above and 4 reached magnitude 5 or above. The average focal depth was 146 km.

The month's largest event in Argentina was a magnitude 5.3 earthquake near Cafayate, Argentina on 20 September 2026 at 08:47 UTC. A magnitude 5.3 earthquake radiates roughly 1,344 tons of TNT equivalent in seismic energy.

That is below the Argentina monthly average of 17 events over the period we cover — a comparatively quiet month, and down from the 14 recorded the previous month.

36% of events here are shallow (under 70 km), 55% intermediate (70–300 km) and 9% 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 7 in the magnitude 4 range, 4 in the magnitude 5 range.

Activity peaked on 23 September, when 2 events were recorded.

The month's largest events were M5.3 near Cafayate, Argentina on 20 September at 10 km; M5.3 near Arauco, Argentina on 23 September at 122 km; M5.1 near Antofagasta de la Sierra, Argentina on 05 September at 10 km.

That is 36% below the 17 events Argentina averages per month across the 23 months on record.