M3.3 Earthquake 64 km WNW of Tanana, Alaska — December 30, 2021
2021-12-30 20:11:30 UTC (2021-12-30) · approx. 10:11 AM UTC-10 local
On December 30, 2021 at 20:11 UTC, a magnitude 3.3 shallow crustal earthquake struck 64 km WNW of Tanana, Alaska, at a depth of 12.2 km and coordinates 65.4156°, -153.3409°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-153.3409°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Tanana, Alaska?
The magnitude 3.3 earthquake that struck 64 km WNW of Tanana, Alaska on December 30, 2021 at 20:11 UTC had a depth of 12.2 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021gqblfbq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 30, 2021). M3.3 Earthquake 64 km WNW of Tanana, Alaska — December 30, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/ak021gqblfbq/