Magnitude 1.4 - 49 miles NE of Ambler
April 18, 2025 03:50:51 AKDT (April 18, 2025 11:50:51 UTC)
67.7398°N 157.1039°W Depth 2.1 miles (3 km)
This event has been reviewed by a seismologist
- 58 miles (94 km) N of Kobuk
- 59 miles (95 km) N of Shungnak
- 103 miles (167 km) NE of Kiana
- 111 miles (179 km) NE of Selawik
- 122 miles (197 km) NE of Noorvik
- 140 miles (226 km) NW of Hughes
- 142 miles (230 km) W of Anaktuvuk Pass
- 143 miles (231 km) N of Huslia
- 145 miles (235 km) NW of Allakaket
- 151 miles (244 km) E of Red Dog Mine site
- 154 miles (249 km) E of Noatak
- 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.
