M3.1 Earthquake 72 km SW of Fort McPherson, Canada — August 28, 2021
2021-08-28 20:06:19 UTC (2021-08-28) · approx. 11:06 AM UTC-9 local
On August 28, 2021 at 20:06 UTC, a magnitude 3.1 shallow crustal earthquake struck 72 km SW of Fort McPherson, Canada, at a depth of 20.5 km and coordinates 66.9183°, -135.8811°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-135.8811°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Fort McPherson, Canada?
The magnitude 3.1 earthquake that struck 72 km SW of Fort McPherson, Canada on August 28, 2021 at 20:06 UTC had a depth of 20.5 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021b18xaje). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 28, 2021). M3.1 Earthquake 72 km SW of Fort McPherson, Canada — August 28, 2021. Retrieved September 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021b18xaje/