M3.9 Earthquake 257 km SSE of Fort McPherson, Canada — April 13, 2021
2021-04-13 22:36:04 UTC (2021-04-13) · approx. 1:36 PM UTC-9 local
On April 13, 2021 at 22:36 UTC, a magnitude 3.9 shallow crustal earthquake struck 257 km SSE of Fort McPherson, Canada, at a depth of 27.3 km and coordinates 65.2357°, -133.1729°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-133.1729°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Fort McPherson, Canada?
The magnitude 3.9 earthquake that struck 257 km SSE of Fort McPherson, Canada on April 13, 2021 at 22:36 UTC had a depth of 27.3 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0214qpo03r). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 13, 2021). M3.9 Earthquake 257 km SSE of Fort McPherson, Canada — April 13, 2021. Retrieved May 8, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak0214qpo03r/