Magnitude 4.2 - 48 miles S of Kaktovik
March 11, 2026 07:59:58 AKDT (March 11, 2026 15:59:58 UTC)
69.4330°N 143.5624°W Depth 3.1 miles (5 km)
This event has been reviewed by a seismologist
- 103 miles (167 km) NE of Arctic Village
- 121 miles (196 km) E of Pump Station #2
- 127 miles (205 km) E of Deadhorse
- 127 miles (205 km) SE of Prudhoe Bay
- 133 miles (215 km) SE of Pump Station #1
- 136 miles (220 km) E of Pump Station #3
- 160 miles (259 km) NE of Pump Station #4
- 167 miles (270 km) NW of Old Crow
- 183 miles (296 km) N of Venetie
- 192 miles (311 km) N of Chalkyitsik
- 203 miles (329 km) N of Fort Yukon
- Magnitude type: ML
- Event type: N/A
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.
