Magnitude 4.0 - 16 miles S of Pump Station #3
July 29, 2023 11:32:49 AKDT (July 29, 2023 19:32:49 UTC)
68.6196°N 148.5829°W Depth 0.8 miles (1 km)
No reports of this event being felt have been received at this time.
This event has been reviewed by a seismologist
- 24 miles (38 km) NE of Pump Station #4
- 58 miles (94 km) S of Pump Station #2
- 85 miles (137 km) NW of Arctic Village
- 87 miles (141 km) NE of Anaktuvuk Pass
- 93 miles (150 km) NE of Wiseman
- 102 miles (165 km) SE of Umiat
- 103 miles (167 km) NE of Coldfoot
- 109 miles (176 km) S of Deadhorse
- 113 miles (183 km) S of Prudhoe Bay
- 113 miles (183 km) S of Pump Station #1
- 125 miles (202 km) NW of Venetie
- 262 miles (424 km) N of Fairbanks
- Magnitude type: Mwr2
- 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.
