M3.6 Earthquake 86 km ENE of Nikolski, Alaska — October 20, 2021
2021-10-20 17:00:51 UTC (2021-10-20) · approx. 6:00 AM UTC-11 local
On October 20, 2021 at 17:00 UTC, a magnitude 3.6 intermediate depth earthquake struck 86 km ENE of Nikolski, Alaska, at a depth of 76.4 km and coordinates 53.2279°, -167.6577°.
Physical scale: An earthquake of magnitude 3.6 releases seismic energy equivalent to roughly 3.8 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 184 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-167.6577°E
Technical Information
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Common Questions
How strong was the magnitude 3.6 earthquake near Nikolski, Alaska?
The magnitude 3.6 earthquake that struck 86 km ENE of Nikolski, Alaska on October 20, 2021 at 17:00 UTC had a depth of 76.4 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 3.6 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.6 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000g9t6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 20, 2021). M3.6 Earthquake 86 km ENE of Nikolski, Alaska — October 20, 2021. Retrieved December 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000g9t6/