M3.3 Earthquake 250 km SSE of Attu Station, Alaska — December 10, 2021
2021-12-10 22:58:17 UTC (2021-12-10) · approx. 10:58 AM UTC+12 local
On December 10, 2021 at 22:58 UTC, a magnitude 3.3 shallow crustal earthquake struck 250 km SSE of Attu Station, Alaska, at a depth of 33.5 km and coordinates 50.8721°, 174.9212°.
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
174.9212°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Attu Station, Alaska?
The magnitude 3.3 earthquake that struck 250 km SSE of Attu Station, Alaska on December 10, 2021 at 22:58 UTC had a depth of 33.5 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: us7000gafs). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 10, 2021). M3.3 Earthquake 250 km SSE of Attu Station, Alaska — December 10, 2021. Retrieved February 24, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000gafs/