Magnitude 1.3 - 69 miles N of Arctic Village
July 31, 2020 02:00:44 AKDT (July 31, 2020 10:00:44 UTC)
69.0753°N 144.6913°W Depth 0.9 miles (1 km)
This event has been reviewed by a seismologist
- 77 miles (124 km) S of Kaktovik
- 98 miles (158 km) E of Pump Station #2
- 104 miles (168 km) E of Pump Station #3
- 118 miles (191 km) SE of Deadhorse
- 119 miles (192 km) SE of Prudhoe Bay
- 125 miles (202 km) SE of Pump Station #1
- 125 miles (202 km) NE of Pump Station #4
- 150 miles (243 km) N of Venetie
- 169 miles (274 km) N of Chalkyitsik
- 169 miles (274 km) NW of Old Crow
- 175 miles (283 km) N of Fort Yukon
- 304 miles (492 km) N of Fairbanks
- 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.
