Magnitude 1.9 - 47 miles S of Kaktovik
March 17, 2025 20:55:00 AKDT (March 18, 2025 04:55:00 UTC)
69.4579°N 143.9775°W Depth 3.3 miles (5 km)
This event has been reviewed by a seismologist
- 100 miles (162 km) N of Arctic Village
- 111 miles (179 km) E of Pump Station #2
- 117 miles (189 km) SE of Deadhorse
- 117 miles (189 km) SE of Prudhoe Bay
- 123 miles (199 km) SE of Pump Station #1
- 127 miles (205 km) E of Pump Station #3
- 152 miles (246 km) NE of Pump Station #4
- 175 miles (283 km) NW of Old Crow
- 180 miles (291 km) N of Venetie
- 194 miles (314 km) N of Chalkyitsik
- 198 miles (321 km) E of Umiat
- 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.
