M3.5 Earthquake 117 km SSE of Ugashik, Alaska — January 14, 2021
2021-01-14 22:31:40 UTC (2021-01-14) · approx. 12:31 PM UTC-10 local
On January 14, 2021 at 22:31 UTC, a magnitude 3.5 shallow crustal earthquake struck 117 km SSE of Ugashik, Alaska, at a depth of 56.6 km and coordinates 56.5743°, -156.5037°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-156.5037°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Ugashik, Alaska?
The magnitude 3.5 earthquake that struck 117 km SSE of Ugashik, Alaska on January 14, 2021 at 22:31 UTC had a depth of 56.6 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021nit4iu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 14, 2021). M3.5 Earthquake 117 km SSE of Ugashik, Alaska — January 14, 2021. Retrieved March 20, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021nit4iu/