Magnitude 1.0 - 19 miles E of Pump Station #3
April 21, 2019 10:34:51 AKDT (April 21, 2019 18:34:51 UTC)
68.7835°N 148.1007°W Depth 8.5 miles (13 km)
This event has been reviewed by a seismologist
- 40 miles (64 km) NE of Pump Station #4
- 48 miles (77 km) S of Pump Station #2
- 79 miles (128 km) NW of Arctic Village
- 97 miles (157 km) S of Deadhorse
- 102 miles (165 km) NE of Anaktuvuk Pass
- 102 miles (165 km) S of Prudhoe Bay
- 103 miles (167 km) S of Pump Station #1
- 107 miles (173 km) E of Umiat
- 108 miles (175 km) NE of Wiseman
- 119 miles (192 km) NE of Coldfoot
- 130 miles (210 km) N of Venetie
- 273 miles (442 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.