Earthquakes in Japan — September 2026

13 earthquakes were recorded in Japan during September 2026, an average of 0.4 per day.

13 reached magnitude 4 or above and 1 reached magnitude 5 or above. The average focal depth was 74 km.

The month's largest event in Japan was a magnitude 5.1 earthquake near Yudomari, Japan on 12 September 2026 at 20:32 UTC. A magnitude 5.1 earthquake radiates roughly 674 tons of TNT equivalent in seismic energy.

That is below the Japan monthly average of 56 events over the period we cover — a comparatively quiet month, and down from the 59 recorded the previous month.

77% of events here are shallow (under 70 km), 15% intermediate (70–300 km) and 8% 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 12 in the magnitude 4 range, 1 in the magnitude 5 range.

Activity peaked on 01 September, when 3 events were recorded.

The month's largest events were M5.1 near Yudomari, Japan on 12 September at 46 km; M4.9 near Volcano Islands, Japan on 02 September at 38 km; M4.9 near Bonin Islands, Japan on 13 September at 10 km.

That is 77% below the 56 events Japan averages per month across the 22 months on record.