Earthquakes in Japan — March 2025

40 earthquakes were recorded in Japan during March 2025, an average of 1.3 per day.

40 reached magnitude 4 or above and 8 reached magnitude 5 or above. The average focal depth was 76 km.

The month's largest event in Japan was a magnitude 5.9 earthquake near Tatsugō, Japan on 08 March 2025 at 23:42 UTC. A magnitude 5.9 earthquake radiates roughly 10,676 tons of TNT equivalent in seismic energy.

That is below the Japan monthly average of 57 events over the period we cover — a comparatively quiet month, and level with the 40 recorded the previous month.

65% of events here are shallow (under 70 km), 32% intermediate (70–300 km) and 2% deep-focus (over 300 km). A substantial share of intermediate-depth events points to a subducting slab beneath the region rather than purely crustal faulting.

By band, the catalogue holds 32 in the magnitude 4 range, 8 in the magnitude 5 range.

Activity peaked on 09 March, when 5 events were recorded.

The month's largest events were M5.9 near Tatsugō, Japan on 08 March at 27 km; M5.7 near Tatsugō, Japan on 08 March at 22 km; M5.3 near Tatsugō, Japan on 11 March at 27 km.

That is 30% below the 57 events Japan averages per month across the 21 months on record.