M3.5 Earthquake 227 km SSE of Atka, Alaska — October 31, 2026
2026-10-31 16:41:34 UTC (3 days ago) · approx. 4:41 AM UTC-12 local
On October 31, 2026 at 16:41 UTC, a magnitude 3.5 shallow crustal earthquake struck 227 km SSE of Atka, Alaska, at a depth of 10.0 km and coordinates 50.2365°, -173.2876°.
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
-173.2876°E
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Common Questions
How strong was the magnitude 3.5 earthquake near Atka, Alaska?
The magnitude 3.5 earthquake that struck 227 km SSE of Atka, Alaska on October 31, 2026 at 16:41 UTC had a depth of 10.0 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 3.5 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: us7000tuvb). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 31, 2026). M3.5 Earthquake 227 km SSE of Atka, Alaska — October 31, 2026. Retrieved November 3, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000tuvb/