Magnitude 3.4 - 49 miles SW of Kaktovik
August 23, 2025 00:00:43 AKDT (August 23, 2025 08:00:43 UTC)
69.5981°N 144.9861°W Depth 10.9 miles (17 km)
This event has been reviewed by a seismologist
- 87 miles (141 km) E of Pump Station #2
- 91 miles (147 km) SE of Deadhorse
- 91 miles (147 km) SE of Prudhoe Bay
- 97 miles (157 km) SE of Pump Station #1
- 103 miles (167 km) N of Arctic Village
- 108 miles (175 km) NE of Pump Station #3
- 135 miles (218 km) NE of Pump Station #4
- 174 miles (282 km) E of Umiat
- 183 miles (296 km) N of Venetie
- 196 miles (317 km) NE of Anaktuvuk Pass
- 199 miles (322 km) NW of Old Crow
- 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.
