M3.1 Earthquake 20 km NE of Nikolaevsk, Alaska — September 21, 2026
2026-09-21 09:38:37 UTC (1 hour ago) · approx. 11:38 PM UTC-10 local
On September 21, 2026 at 09:38 UTC, a magnitude 3.1 shallow crustal earthquake struck 20 km NE of Nikolaevsk, Alaska, at a depth of 45.9 km and coordinates 59.9340°, -151.3280°.0
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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from submitted citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-151.3280°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near Nikolaevsk, Alaska?
The magnitude 3.1 earthquake that struck 20 km NE of Nikolaevsk, Alaska on September 21, 2026 at 09:38 UTC had a depth of 45.9 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.
Actions
Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026ssnawb). 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 20 km NE of Nikolaevsk, Alaska — September 21, 2026. Retrieved September 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026ssnawb/