Magnitude 1.7 - 20 miles SE of Pump Station #10
September 4, 2023 13:50:44 AKDT (September 4, 2023 21:50:44 UTC)
63.3069°N 145.1715°W Depth 5.8 miles (9 km)
This event has been reviewed by a seismologist
- 21 miles (34 km) NE of Paxson
- 47 miles (76 km) SE of Pump Station #9
- 50 miles (81 km) S of Fort Greely
- 53 miles (85 km) S of Delta Junction
- 56 miles (90 km) NW of Slana
- 68 miles (110 km) W of Tok
- 70 miles (113 km) N of Gakona
- 83 miles (134 km) N of Glennallen
- 84 miles (136 km) W of Tetlin
- 85 miles (137 km) N of Pump Station #11
- 94 miles (152 km) N of Copper Center
- 131 miles (212 km) SE of Fairbanks
- 210 miles (340 km) NE of Anchorage
- 500 miles (810 km) NW of Juneau
- Magnitude type: Ml
- Event type: earthquake
Tectonic Setting of the Denali Fault
The Denali Fault is a major intracontinental right-lateral strike-slip fault that partially accommodates the oblique collision of the Yakutat block into Alaska's margin, extending from northwestern British Columbia to the central and western regions of Alaska. The largest earthquake recorded on the Denali Fault was a M7.9 on November 3, 2002. Its rupture extended for nearly 270 miles (435 km) along the central Denali Fault system. This event was preceded by the M6.7 Nenana Mountain Earthquake on October 23, which ruptured 25 miles (40 km) of the Denali Fault west of the M7.9 event. It is typical behavior of these major right-lateral faults in the Interior to produce very low background levels of seismicity between large ruptures hundreds of years apart that are followed by multi-year aftershock sequences. Another notable feature associated with the Denali Fault system is the Kantishna seismic cluster, located just north of the main fault trace inside Denali National Park. This cluster produces tens of small, shallow earthquakes every day. The largest known earthquakes in this cluster are on the order of magnitude 5, but those are rare. This cluster is believed to accommodate deformation between the Denali Fault and the Minto Flats Seismic Zone to the north.