Magnitude 1.7 - 38 miles E of Pump Station #3
September 25, 2023 00:48:32 AKDT (September 25, 2023 08:48:32 UTC)
68.9412°N 147.3427°W Depth 3.5 miles (5 km)
This event has been reviewed by a seismologist
- 47 miles (76 km) SE of Pump Station #2
- 62 miles (100 km) NE of Pump Station #4
- 73 miles (118 km) NW of Arctic Village
- 90 miles (145 km) S of Deadhorse
- 94 miles (152 km) S of Prudhoe Bay
- 96 miles (155 km) S of Pump Station #1
- 122 miles (197 km) SW of Kaktovik
- 122 miles (197 km) E of Umiat
- 124 miles (201 km) NE of Anaktuvuk Pass
- 128 miles (207 km) NE of Wiseman
- 136 miles (220 km) N of Venetie
- 284 miles (460 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.
