Magnitude 1.1 - 68 miles SW of Kaktovik
August 1, 2020 02:39:03 AKDT (August 1, 2020 10:39:03 UTC)
69.2170°N 144.7127°W Depth 15.9 miles (25 km)
This event has been reviewed by a seismologist
- 78 miles (126 km) N of Arctic Village
- 95 miles (154 km) E of Pump Station #2
- 105 miles (170 km) E of Pump Station #3
- 111 miles (179 km) SE of Deadhorse
- 112 miles (181 km) SE of Prudhoe Bay
- 118 miles (191 km) SE of Pump Station #1
- 128 miles (207 km) NE of Pump Station #4
- 159 miles (257 km) N of Venetie
- 176 miles (285 km) NW of Old Crow
- 179 miles (290 km) N of Chalkyitsik
- 182 miles (295 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.