Magnitude 1.7 - 31 miles N of Kobuk
September 15, 2025 04:12:26 AKDT (September 15, 2025 12:12:26 UTC)
67.3493°N 156.6606°W Depth 0.0 miles (0 km)
This event has not been reviewed by a seismologist
- 34 miles (55 km) N of Shungnak
- 37 miles (59 km) NE of Ambler
- 104 miles (168 km) E of Kiana
- 104 miles (168 km) NE of Selawik
- 112 miles (181 km) NW of Hughes
- 115 miles (186 km) N of Huslia
- 122 miles (197 km) NW of Allakaket
- 123 miles (199 km) E of Noorvik
- 137 miles (222 km) W of Bettles
- 140 miles (226 km) W of Anaktuvuk Pass
- 144 miles (233 km) NE of Buckland
- 304 miles (492 km) NW of Fairbanks
- Magnitude type: Ml
- Event type: earthquake
Tectonic Setting of the Brooks Range
Seismicity in the Brooks Range is characterized by intraplate earthquakes associated with mountain building and crustal reorganization. A broad earthquake band extends from northeast of the Brooks Range toward the Beaufort Sea. Earthquake source mechanisms comprise a mixture of strike-slip and normal faulting events, indicative of north-northwest compression and northeast extension. A magnitude 6.4 earthquake on August 12, 2018 located 43 miles (69 km) south of Kaktovik was the largest earthquake ever recorded north of the Brooks Range. It produced an energetic aftershock sequence that continues to this day. In 2019, a vigorous swarm sequence began in the Purcell Mountains. More than 9,000 earthquakes have been recorded as part of this swarm through the end of 2021, including five earthquakes with magnitudes larger than 5. At present, this swarm continues, though at a decreased activity level.
