M3.4 Earthquake 50 km S of Shishmaref, Alaska — October 18, 2026
2026-10-18 04:54:43 UTC (2 hours ago) · approx. 5:54 PM UTC-11 local
On October 18, 2026 at 04:54 UTC, a magnitude 3.4 shallow crustal earthquake struck 50 km S of Shishmaref, Alaska, at a depth of 10.0 km and coordinates 65.8000°, -166.0950°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-166.0950°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Shishmaref, Alaska?
The magnitude 3.4 earthquake that struck 50 km S of Shishmaref, Alaska on October 18, 2026 at 04:54 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026uqacer). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 18, 2026). M3.4 Earthquake 50 km S of Shishmaref, Alaska — October 18, 2026. Retrieved October 18, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026uqacer/