M3.0 Earthquake 80 km SE of Sand Point, Alaska — December 27, 2021
2021-12-27 23:01:25 UTC (2021-12-27) · approx. 12:01 PM UTC-11 local
On December 27, 2021 at 23:01 UTC, a magnitude 3.0 shallow crustal earthquake struck 80 km SE of Sand Point, Alaska, at a depth of 23.4 km and coordinates 54.7449°, -159.7882°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-159.7882°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Sand Point, Alaska?
The magnitude 3.0 earthquake that struck 80 km SE of Sand Point, Alaska on December 27, 2021 at 23:01 UTC had a depth of 23.4 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000geqg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 27, 2021). M3.0 Earthquake 80 km SE of Sand Point, Alaska — December 27, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000geqg/