M3.1 Earthquake 106 km SSW of Nikolski, Alaska — September 2, 2026
2026-09-02 10:03:25 UTC (1 day ago) · approx. 11:03 PM UTC-11 local
On September 2, 2026 at 10:03 UTC, a magnitude 3.1 shallow crustal earthquake struck 106 km SSW of Nikolski, Alaska, at a depth of 21.9 km and coordinates 52.0320°, -169.3440°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.5 mainshock that occurred 41 minutes ago 100 km S of Nikolski, Alaska. Since the mainshock, the USGS has recorded 85 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-169.3440°E
Technical Information
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Common Questions
How strong was the magnitude 3.1 earthquake near Nikolski, Alaska?
The magnitude 3.1 earthquake that struck 106 km SSW of Nikolski, Alaska on September 2, 2026 at 10:03 UTC had a depth of 21.9 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.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 3.1 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 100 km S of Nikolski, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026rjlltn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 2, 2026). M3.1 Earthquake 106 km SSW of Nikolski, Alaska — September 2, 2026. Retrieved September 3, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026rjlltn/