Information on the earthquake: moderate mag. 4.0 earthquake


Moderate magnitude earthquake 4.0 to 13 km deep

5 October 18:29 UTC: First to report: USGS after 5 minutes.
5 October 20:11: Now using NRCAN data updates

Updated Tue Oct 5, 2021, 18:33

Small magnitude 3.9 earthquake hits 26 miles south of Alcan, Canada border in morning

3.9 earthquake 42 km south of the Alcan, Alaska border on October 5, 2021 at 10:24 a.m. (GMT -8)

3.9 earthquake 42 km south of the Alcan, Alaska border on October 5, 2021 at 10:24 a.m. (GMT -8)

Just 9 minutes ago, a magnitude 3.9 earthquake struck near the Alcan border in southeast Fairbanks County, Alaska, United States. The tremor was recorded on the morning of Tuesday, October 5, 2021 at 10:24 a.m. local time at a shallow depth of 11 miles below the surface.
The event was classified by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the Euro-Mediterranean Seismological Center (EMSC) which also listed the 3.9 magnitude earthquake.
Cities near the epicenter where the quake could have been felt as very weak tremors include Alcan Border (pop. 33) located 42 km from the epicenter.

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Earthquake data

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Date and hour : 5 Oct 2021 18:24:30 UTC –
Local time at epicenter: Tuesday October 5, 2021 10:24 am (GMT -8)
Size: 4
Depth: 13.0 km

Latitude / longitude of epicenter: 62.2263 ° N / 141.5568 ° W↗ (Southeast of Fairbanks, Alaska, United States)
Antipode: 62.226 ° S / 38.443 ° E↗
Nearest volcano: Churchill (109 km / 68 mi)

Nearby towns and villages:
54 km (34 mi) SSO of Alcan border (southeast of Fairbanks) (pop: 33) -> See nearby earthquakes!
143 km (89 mi) to SSE of Tok (pop: 1,260) -> See nearby earthquakes!
260 km (161 mi) southeast of Deltana (pop: 2,250) -> See nearby earthquakes!
281 km (174 mi) ENE of Valdez (pop: 3,870) -> Watch the earthquakes nearby!
384 km (239 mi) WNW of Whitehorse (Yukon, Canada) (pop: 23,300) -> Observe the earthquakes nearby!
412 km (256 mi) southeast of Badger (pop: 19,500) -> Observe the earthquakes nearby!
421 km (262 mi) southeast of Fairbanks (pop: 32,300) -> See nearby earthquakes!
433 km (269 mi) ENE from Eagle River (pop: 24,800) -> Observe the earthquakes nearby!
433 km (269 mi) ENE from Eagle River (Anchorage) (pop: 24,800) -> Observe the earthquakes nearby!
587 km (365 mi) northwest of Juneau (pop: 32,800) -> Observe the earthquakes nearby!

Main data source: NRCAN (Department of Natural Resources Canada)

Estimated energy released: 6.3 x 10ten joules (17.5 megawatt hours, equivalent to 15.1 tonnes of TNT) Find out more

If you felt this tremor (or if you were near the epicenter), share your experience and submit a short “I felt it” report! Other users would love to hear about it!
If you did NOT feel the earthquake although you are in the area, please report it! Your contribution is valuable to earthquake science, seismic risk analysis and mitigation efforts. You can use your device’s location or the map to show where you were during the earthquake. Thank you!

Data for the same earthquake reported by different agencies

Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the seismic parameters to be calculated with near optimum accuracy.

Mag. Depth Site Source
4.0 13 km 42 km south of the Alcan, Alaska border NRCan
3.9 18 km 39 km on the southwest of Beaver Creek, YT USGS

Previous earthquakes in the same region

Click here to search our database for previous earthquakes in the same area since 1900!


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