M3.4 Earthquake 33 km W of Nanwalek, Alaska — September 23, 2026
2026-09-23 16:38:10 UTC (9 hours ago) · approx. 6:38 AM UTC-10 local
On September 23, 2026 at 16:38 UTC, a magnitude 3.4 intermediate depth earthquake struck 33 km W of Nanwalek, Alaska, at a depth of 71.8 km and coordinates 59.4020°, -152.5030°.
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
-152.5030°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Nanwalek, Alaska?
The magnitude 3.4 earthquake that struck 33 km W of Nanwalek, Alaska on September 23, 2026 at 16:38 UTC had a depth of 71.8 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: aka2026swtbxe). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 23, 2026). M3.4 Earthquake 33 km W of Nanwalek, Alaska — September 23, 2026. Retrieved September 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026swtbxe/