M3.4 Earthquake 24 km S of False Pass, Alaska — December 31, 2021
2021-12-31 23:10:35 UTC (2021-12-31) · approx. 12:10 PM UTC-11 local
On December 31, 2021 at 23:10 UTC, a magnitude 3.4 shallow crustal earthquake struck 24 km S of False Pass, Alaska, at a depth of 20.0 km and coordinates 54.6316°, -163.3762°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-163.3762°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near False Pass, Alaska?
The magnitude 3.4 earthquake that struck 24 km S of False Pass, Alaska on December 31, 2021 at 23:10 UTC had a depth of 20.0 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000gazr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 31, 2021). M3.4 Earthquake 24 km S of False Pass, Alaska — December 31, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000gazr/