M3.1 Earthquake 41 km SSE of Unalaska, Alaska — January 31, 2023
2023-01-31 20:26:30 UTC (2023-01-31) · approx. 9:26 AM UTC-11 local
On January 31, 2023 at 20:26 UTC, a magnitude 3.1 shallow crustal earthquake struck 41 km SSE of Unalaska, Alaska, at a depth of 62.6 km and coordinates 53.5532°, -166.2106°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-166.2106°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Unalaska, Alaska?
The magnitude 3.1 earthquake that struck 41 km SSE of Unalaska, Alaska on January 31, 2023 at 20:26 UTC had a depth of 62.6 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000jn55). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, January 31, 2023). M3.1 Earthquake 41 km SSE of Unalaska, Alaska — January 31, 2023. Retrieved April 13, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000jn55/