M3.9 Earthquake 172 km SE of Akutan, Alaska — November 1, 2025
2025-11-01 23:22:20 UTC (2025-11-01) · approx. 12:22 PM UTC-11 local
On November 1, 2025 at 23:22 UTC, a magnitude 3.9 shallow crustal earthquake struck 172 km SE of Akutan, Alaska, at a depth of 10.0 km and coordinates 52.8860°, -164.2333°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-164.2333°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Akutan, Alaska?
The magnitude 3.9 earthquake that struck 172 km SE of Akutan, Alaska on November 1, 2025 at 23:22 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000rpf0). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, November 1, 2025). M3.9 Earthquake 172 km SE of Akutan, Alaska — November 1, 2025. Retrieved January 27, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rpf0/