M3.4 Earthquake 28 km E of Slana, Alaska — December 28, 2021
2021-12-28 23:21:08 UTC (2021-12-28) · approx. 1:21 PM UTC-10 local
On December 28, 2021 at 23:21 UTC, a magnitude 3.4 shallow crustal earthquake struck 28 km E of Slana, Alaska, at a depth of 4.4 km and coordinates 62.6689°, -143.4024°.
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
-143.4024°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Slana, Alaska?
The magnitude 3.4 earthquake that struck 28 km E of Slana, Alaska on December 28, 2021 at 23:21 UTC had a depth of 4.4 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 3.4 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: ak021gn2d4bx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 28, 2021). M3.4 Earthquake 28 km E of Slana, Alaska — December 28, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/ak021gn2d4bx/