Earthquakes in the Northern Mariana Islands — August 2026

6 earthquakes were recorded in the Northern Mariana Islands during August 2026, an average of 0.2 per day.

6 reached magnitude 4 or above and 0 reached magnitude 5 or above. The average focal depth was 129 km.

The month's largest event in the Northern Mariana Islands was a magnitude 4.9 earthquake near San Jose Village, Northern Mariana Islands on 22 August 2026 at 05:47 UTC. A magnitude 4.9 earthquake radiates roughly 338 tons of TNT equivalent in seismic energy.

That is well above the the Northern Mariana Islands monthly average of 3 events over the period we cover — an unusually active month, and up from the 4 recorded the previous month.

33% of events here are shallow (under 70 km), 67% intermediate (70–300 km) and 0% 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 6 in the magnitude 4 range.

Activity peaked on 22 August, when 2 events were recorded.

The month's largest events were M4.9 near San Jose Village, Northern Mariana Islands on 22 August at 10 km; M4.8 near Saipan, Northern Mariana Islands on 17 August at 10 km; M4.7 near Pagan region, Northern Mariana Islands on 24 August at 206 km.

That is 76% above the 3 events the Northern Mariana Islands averages per month across the 20 months on record.