M4.1 Earthquake near Rat Islands, Aleutian Islands, Alaska — December 10, 2021
2021-12-10 20:15:58 UTC (2021-12-10) · approx. 8:15 AM UTC+12 local
On December 10, 2021 at 20:15 UTC, a magnitude 4.1 shallow crustal earthquake struck near Rat Islands, Aleutian Islands, Alaska, at a depth of 10.0 km and coordinates 51.9136°, 178.2766°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
178.2766°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Rat Islands, Aleutian Islands, Alaska?
The magnitude 4.1 earthquake that struck near Rat Islands, Aleutian Islands, Alaska on December 10, 2021 at 20:15 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000gbe5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 10, 2021). M4.1 Earthquake near Rat Islands, Aleutian Islands, Alaska — December 10, 2021. Retrieved February 24, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gbe5/