M3.1 Earthquake 172 km WSW of Nikolski, Alaska — September 17, 2026
2026-09-17 19:07:29 UTC (5 days ago) · approx. 8:07 AM UTC-11 local
On September 17, 2026 at 19:07 UTC, a magnitude 3.1 intermediate depth earthquake struck 172 km WSW of Nikolski, Alaska, at a depth of 100.2 km and coordinates 52.2510°, -171.1480°.
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
-171.1480°E
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Common Questions
How strong was the magnitude 3.1 earthquake near Nikolski, Alaska?
The magnitude 3.1 earthquake that struck 172 km WSW of Nikolski, Alaska on September 17, 2026 at 19:07 UTC had a depth of 100.2 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: aka2026slvyjd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 17, 2026). M3.1 Earthquake 172 km WSW of Nikolski, Alaska — September 17, 2026. Retrieved September 22, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026slvyjd/