M3.7 Earthquake 82 km E of Nikolski, Alaska — October 13, 2021
2021-10-13 22:17:50 UTC (2021-10-13) · approx. 11:17 AM UTC-11 local
On October 13, 2021 at 22:17 UTC, a magnitude 3.7 shallow crustal earthquake struck 82 km E of Nikolski, Alaska, at a depth of 41.7 km and coordinates 52.8358°, -167.6510°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-167.6510°E
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Common Questions
How strong was the magnitude 3.7 earthquake near Nikolski, Alaska?
The magnitude 3.7 earthquake that struck 82 km E of Nikolski, Alaska on October 13, 2021 at 22:17 UTC had a depth of 41.7 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000fvns). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 13, 2021). M3.7 Earthquake 82 km E of Nikolski, Alaska — October 13, 2021. Retrieved December 18, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fvns/