M3.1 Earthquake 77 km WSW of Akhiok, Alaska — September 21, 2026
2026-09-21 19:32:47 UTC (45 min ago) · approx. 9:32 AM UTC-10 local
On September 21, 2026 at 19:32 UTC, a magnitude 3.1 shallow crustal earthquake struck 77 km WSW of Akhiok, Alaska, at a depth of 52.0 km and coordinates 56.6750°, -155.3390°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-155.3390°E
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Common Questions
How strong was the magnitude 3.1 earthquake near Akhiok, Alaska?
The magnitude 3.1 earthquake that struck 77 km WSW of Akhiok, Alaska on September 21, 2026 at 19:32 UTC had a depth of 52.0 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026stgwir). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 21, 2026). M3.1 Earthquake 77 km WSW of Akhiok, Alaska — September 21, 2026. Retrieved September 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026stgwir/