Earthquakes in the Northern Mariana Islands — June 2025

5 earthquakes were recorded in the Northern Mariana Islands during June 2025, an average of 0.2 per day.

5 reached magnitude 4 or above and 1 reached magnitude 5 or above. The average focal depth was 271 km.

The month's largest event in the Northern Mariana Islands was a magnitude 5.1 earthquake near Saipan, Northern Mariana Islands on 19 June 2025 at 13:07 UTC. A magnitude 5.1 earthquake radiates roughly 674 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 3 recorded the previous month.

20% of events here are shallow (under 70 km), 40% intermediate (70–300 km) and 40% 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 4 in the magnitude 4 range, 1 in the magnitude 5 range.

The month's largest events were M5.1 near Saipan, Northern Mariana Islands on 19 June at 8 km; M4.9 near Pagan region, Northern Mariana Islands on 06 June at 468 km; M4.9 near Pagan region, Northern Mariana Islands on 02 June at 276 km.

That is 49% above the 3 events the Northern Mariana Islands averages per month across the 20 months on record.