M4.0 Earthquake 195 km SE of Akutan, Alaska — October 21, 2026
2026-10-21 10:46:01 UTC (7 hours ago) · approx. 11:46 PM UTC-11 local
On October 21, 2026 at 10:46 UTC, a magnitude 4.0 shallow crustal earthquake struck 195 km SE of Akutan, Alaska, at a depth of 28.2 km and coordinates 53.0500°, -163.4520°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-163.4520°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Akutan, Alaska?
The magnitude 4.0 earthquake that struck 195 km SE of Akutan, Alaska on October 21, 2026 at 10:46 UTC had a depth of 28.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: aka2026uvzyoa). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 21, 2026). M4.0 Earthquake 195 km SE of Akutan, Alaska — October 21, 2026. Retrieved October 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026uvzyoa/