Magnitude 1.7 - 42 miles W of Arctic Village
September 28, 2020 03:54:22 AKDT (September 28, 2020 11:54:22 UTC)
68.1100°N 147.1589°W Depth 5.2 miles (8 km)
This event has been reviewed by a seismologist
- 60 miles (97 km) E of Pump Station #4
- 66 miles (107 km) SE of Pump Station #3
- 79 miles (128 km) N of Venetie
- 91 miles (147 km) NE of Wiseman
- 99 miles (160 km) NE of Coldfoot
- 100 miles (162 km) S of Pump Station #2
- 118 miles (191 km) E of Anaktuvuk Pass
- 118 miles (191 km) NW of Fort Yukon
- 121 miles (196 km) N of Beaver
- 129 miles (209 km) NE of Pump Station #5
- 133 miles (215 km) N of Birch Creek
- 227 miles (368 km) N of Fairbanks
- Magnitude type: Ml2
- 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.