M3.1 Earthquake 223 km SSE of Atka, Alaska — September 12, 2026
2026-09-12 04:47:18 UTC (12 hours ago) · approx. 4:47 PM UTC-12 local
On September 12, 2026 at 04:47 UTC, a magnitude 3.1 shallow crustal earthquake struck 223 km SSE of Atka, Alaska, at a depth of 20.0 km and coordinates 50.3080°, -173.1150°.
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
-173.1150°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Atka, Alaska?
The magnitude 3.1 earthquake that struck 223 km SSE of Atka, Alaska on September 12, 2026 at 04:47 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 3.1 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: aka2026sbndnt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 12, 2026). M3.1 Earthquake 223 km SSE of Atka, Alaska — September 12, 2026. Retrieved September 12, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026sbndnt/