M3.3 Earthquake 225 km SE of Chiniak, Alaska — October 16, 2026
2026-10-16 19:59:15 UTC (2026-10-16) · approx. 9:59 AM UTC-10 local
On October 16, 2026 at 19:59 UTC, a magnitude 3.3 shallow crustal earthquake struck 225 km SE of Chiniak, Alaska, at a depth of 5.0 km and coordinates 56.3350°, -149.3970°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-149.3970°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Chiniak, Alaska?
The magnitude 3.3 earthquake that struck 225 km SE of Chiniak, Alaska on October 16, 2026 at 19:59 UTC had a depth of 5.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026unmgrm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 16, 2026). M3.3 Earthquake 225 km SE of Chiniak, Alaska — October 16, 2026. Retrieved October 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026unmgrm/