Magnitude 2.8 - 45 miles E of Ruby
May 3, 2021 08:25:12 AKDT (May 3, 2021 16:25:12 UTC)
64.9676°N 154.053°W Depth 22.4 miles (36 km)
This event has not been reviewed by a seismologist
- 59 miles (95 km) W of Tanana
- 74 miles (119 km) S of Hughes
- 84 miles (136 km) SE of Huslia
- 86 miles (139 km) E of Galena
- 92 miles (149 km) NW of Lake Minchumina
- 100 miles (162 km) W of Manley Hot Springs
- 107 miles (173 km) E of Koyukuk
- 112 miles (181 km) N of Telida
- 117 miles (189 km) S of Allakaket
- 118 miles (191 km) W of Rampart
- 120 miles (194 km) E of Nulato
- 186 miles (301 km) W of Fairbanks
- 290 miles (470 km) NW of Anchorage
- Magnitude type: Ml2
- Event type: earthquake
Tectonic Setting of Interior Alaska
Interior Alaska seismicity reflects transpression and block rotation. Three different types of
tectonic structures contribute to generating seismicity in this region: right-lateral strike-slip
faults (Denali, Tintina, Kaltag), north-northeast-trending seismic zones (Minto, Fairbanks, Salcha,
Dall City, Rampart), and thrust faults in the northern foothills of the Alaska Range. The largest
event recorded in the Interior was the 1937 M7.3 Salcha Earthquake. It produced extensive ground
failures in the epicentral area, but there was no documented evidence of surface rupture. Other
notable events include the 1968 M7.1 Rampart, the 1985 M6.1 Dall City, and the 1995 M6.0 Minto Flats
earthquakes. The Fairbanks Seismic Zone was the site of three M5-6 earthquakes in 1967. A M7.2
thrusting event occurred in 1947 at the front edge of the northern foothills of the Alaska Range
and south of the Salcha Seismic Zone. This event, along with current seismic activity, is indicative
of ongoing thrusting deformation on the north side of the central Alaska Range. East of longitude
146 degrees west, the seismic activity between the Tintina Fault to the north and the Denali Fault to the
south decreases considerably.