Magnitude 1.7 - 40 miles S of Kaktovik
April 23, 2025 21:03:00 AKDT (April 24, 2025 05:03:00 UTC)
69.5813°N 144.2365°W Depth 0.0 miles (0 km)
This event has not been reviewed by a seismologist
- 105 miles (170 km) E of Pump Station #2
- 106 miles (171 km) N of Arctic Village
- 108 miles (175 km) E of Deadhorse
- 108 miles (175 km) SE of Prudhoe Bay
- 114 miles (184 km) E of Pump Station #1
- 124 miles (201 km) NE of Pump Station #3
- 150 miles (243 km) NE of Pump Station #4
- 185 miles (299 km) NW of Old Crow
- 186 miles (301 km) N of Venetie
- 192 miles (311 km) E of Umiat
- 203 miles (329 km) N of Chalkyitsik
- 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.
