Magnitude 1.1 - 60 miles S of Kaktovik
July 30, 2020 17:38:58 AKDT (July 31, 2020 01:38:58 UTC)
69.2918°N 144.3708°W Depth 4.7 miles (7 km)
This event has been reviewed by a seismologist
- 86 miles (139 km) N of Arctic Village
- 103 miles (167 km) E of Pump Station #2
- 114 miles (184 km) E of Pump Station #3
- 115 miles (186 km) SE of Deadhorse
- 116 miles (188 km) SE of Prudhoe Bay
- 121 miles (196 km) SE of Pump Station #1
- 138 miles (223 km) NE of Pump Station #4
- 166 miles (269 km) N of Venetie
- 173 miles (280 km) NW of Old Crow
- 183 miles (296 km) N of Chalkyitsik
- 189 miles (306 km) E of Umiat
- 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.